To say that desk work is frustrating doesn't begin to convey today's small agonies. I'm attempting to georeference new and improved satellite photography for our mapping project. I am using a program called ArcGIS, and its offshoot known as ArcMap, to compare the old satellite imagery with the new. Unfortunately, the new images come to me as 1 kilometer squares with absolutely no reference points (aside from their topographic features). I have to place the new image over several older ones and then compare distinctive features to link the images up. Imagine trying to take two different tracings and line them up as closely as possible by stitching them together. It's a very time-intensive job, since you have to look for the smallest recognizable features to stitch in order to make an accurate map.

I spent 5 hours working on one quadrant (Mauna Loa's summit and the NOAA Weather Observatory on its flank). Guess what happened? Yes, the computer lost the data. 26 meticulously georeferenced points. 5 hours of beating the thing into submission, and all for naught. ARGH. I will conquer it tomorrow, I swear.

Here's a sample of the type of images I'm working with. The Big Island is 10,432 square kilometers. Each image I work with is one kilometer. You can see how this would take quite a while.

Since I haven't posted one of these before, this shows how much of the Big Island's surface area is covered by its various volcanoes. Mauna Loa is huge, and covers 51% of the island. Remember that Hualalai, Mauna Loa, and Kilauea are the only 3 active volcanoes. Hualalai has been dormant for some time, and doesn't have much eruptive capability left. Kilauea is always erupting (these days) and is the current star of the show. However, the amount of lava produced by Kilauea in one day was produced by Mauna Loa in 20 minutes in 1984. It's far and away the most potentially dangerous volcano in Hawai`i.

Thankfully, we're going on a field trip up Mauna Loa on Thursday. I am so excited to get out of the office it's almost silly. The week after this one I'll either be hacking through the low jungles of Mauna Loa's eastern flank doing a gravity survey, or up on Mauna Loa's summit doing more kinematic GPS. Down with office work!*

*Bear in mind that office work is also necessary for good science, and that the author of this post is just mildly stir-crazy.

Neste tutorial abordaremos a criação de áreas através de Azimutes e Distâncias. Esse tipo de atividade é bastante recorrente no dia-a-dia dos profissionais de Agrimensura, Engenharia, Geografia e outros.

O azimute de uma linha é o ângulo horizontal medido de um meridiano à linha, medida no sentido horário do norte.

O exemplo que vamos utilizar é o Memorial Descritivo do Parque Ecológico da UHE Tucuruí.

Então vamos ao trabalho!

Estude +

Por: Luis Sadeck

Analysis:  With these sites, Chris Anderson is promoting what he calls "Crowdsourced Aerial Imagery."  In the mission statement for DIY Drones, he writes that "Reasons to make your own UAV range from a fun technical challenge, student contests, aerial photography and mapping (what we call "GeoCrawling"), and scientific sensing. We are primarily interested in civilian, not military, UAV uses here." (Emphasis is in the original.)

Let's presume that individual DoD or intelligence-agency personnel have an interest in such issues, and maybe even in spending their personal time by keeping current and following the crowd's interest in such topics, by participating in these new social networks.  One can then assume that others from foreign intelligence might have some interest in tracking those very IC personnel, by observing their activities within social networks (and not just Ning ones).  No spectacular logic needed for that.

The CIA has had some challenges in understanding their field presence within the Long Tail. 

 Today’s Washington Post has the following tidbits from the long-running case in Italian courts accusing CIA personnel in absentia of snatching radical Islamic cleric Abu Omar in Milan in 2003.   Italian police “found a trove of clues on the home computer of the CIA's chief spy in Milan… street maps on the CIA officer's computer that had been downloaded from an Internet travel service, Expedia.com. The maps, he said, showed the quickest routes from the cleric's mosque and home in Milan to Aviano Air Base… Recovered computer files also showed that [a CIA officer] used Expedia to book a plane reservation to Cairo around the time Nasr was kidnapped…"

The Post story today also recounts that "The computer also contained a list of about 70 hotels around Milan that Italian investigators used to help identify CIA operatives who played a role in the kidnapping… Italian authorities have said they were astounded to find the evidence left unprotected on [the officer's] computer. But according to the testimony and court records, the CIA repeatedly failed to cover its tracks during the operation. While most of the CIA officers used false identities, they left a long paper and electronic trail that enabled Italian investigators to retrace their movements, court documents show."

The point I'm addressing is not about collaboration among intelligence analysts and officers, within secure networks -- the "Intellipedia revolution" advocated ably by people like the IC's Chris Rasmussen.  Rather, it's about the desire of intelligence professionals to operate in today's Internet-enabled world, without leaving overt traces which can directly point back to them and reveal patterns or identifiers they don't want to leave.  That desire could be expressed as planning to operate on the grid, but appearing to be off the grid - except when they perhaps find it in their interest to leave a constructed "false-flag" grid trail.

If you think about it, the ordinary Internet user probably has the same thought sometimes.  My wife complains about a certain competing search engine, not out of corporate loyalty to my employer, but because she's become annoyed by the overwhelming ubiquity of targeted ads, in search results, emails, RSS feeds, etc. 

If you want to witness these motivations further, just check out the "Welcome to the Underground" blog, particularly last month's post "Staying Off the Grid, Vol. 1."   That's only the tip of the iceberg.

I'd recommend that users, IT professionals, and policymakers all stay current on secure, private, and reliable computing practices, as with Microsoft's Trustworthy Computing initiative.  Anyone who isn't careful in the Long Tail today about the information they're scattering for potential abuse in identity-theft or fraud, may find themselves with the same regrets as that Italian-based CIA officer, certainly wishing now that he'd understood more about cookies and web traces.

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Caros amigos, hoje vamos tentar fazer uma tutorial conjugado para extração de relevo utilizando o Global Mapper e o ArcGIS. Nesse trabalho usaremos alguns procedimentos que já foram descritos anteriormente, como Conversão para 8 bit, fusão e outros.

Esse tutorial foi provocado por um amigo que estava tendo problemas com o procedimento de fusão da SRTM.

Primeiramente vamos baixar os arquivos matriciais do site da Embrapa http://www.relevobr.cnpm.embrapa.br/ e do INPE http://www.dgi.inpe.br/CDSR/

Para dar mais suporte ao estudo, ai vão alguns artigos.

Fusão de dados SRTM com dados Landsat TM 5 para estudo geomorfológico: Região dos Cabos Orange e Cassiporé, Amapá

Uso de Imagens SRTM e Landsat ETM+7 para o mapeamento geomorfológico dos ambientes costeiros do nordeste do Pará

Integração de dados multifontes para mapeamentos temáticos

]]> http://practicalconservation.wordpress.com/?p=50 Mon, 16 Jun 2008 18:03:52 +0000 Sam Riffell http://practicalconservation.wordpress.com/?p=50 The folks at CorridorDesign.org say it best "Our goal is to transfer everything we've learned about designing wildlife corridors to the public to facilitate better conservation, science, and dialogue."  The site includes examples, how-tos, white papers and - best-of-all - dozens of ArcGIS extensions.  All free.  Developed for Arizona, no doubt they could be adapted for anywhere.  See the scientific publication in Conservation Biology.  You could make an entire graduate seminar course out of this website!!

Hoje começaremos as demonstrações de algumas funcionalidades de conversão de vetores, tanto nos procedimentos básicos do ArcGIS como com a extensão ET GeoWizards, que pode ser baixada no link ET GeoWizards. Essa extensão traz muitas facilidades e tem como princípio a qualidade na produção dos dados e agilidade de processos, além de outras funcionalidades.
Será apresentado nesse tutorial a seguinte conversão (Polígono para linha).

Por: Luis Sadeck

]]> http://dyraizaz.wordpress.com/?p=3 Mon, 09 Jun 2008 07:52:50 +0000 dyraizaz http://dyraizaz.wordpress.com/?p=3 Temukan langkah-langkah install ArcGIS di Windows Vista secara rinci. Posting tersebut mungkin bisa memberi jawaban pertanyaan-pertanyaan tentang cara installasi ArcGIS di Windows Vista. Read more..

1. Sebagai langkah pertama, install License Manager ArcGIS 9.2 secara standar sebagaimana biasa dilakukan pada tahap awal instalasi ArcGIS
2. Setelah reboot, ArcGIS License Manager tidak akan berfungsi. Untuk itu, hilangkan (remove) ArcGIS License Manager Service dengan menggunakan utiliti tertentu (misalnya menggunakan the srvinstw.exe GUI dari Microsoft, sc command-line dari Microsoft, atau WinSIM GUI dari Frameworkx). Ingat bahwa HANYA SERVICEnya saja yang dibuang
3. Uninstall driver untuk hardware key (dongle) yang terpasang. Dapatkan driver untuk hardware key terbaru dari http://www.safenet-inc.com/support/tech/sentinel.asp , kemudian lepaskan hardware key (dongle) dari tempatnya
4. Dengan kondisi hardware key terlepas, install kembali driver yang telah didownload dengan memilih untuk menginstall driver usb/parallel saja. Setelah selesai dengan instalasi, hardware key dapat dipasang kembali
5. Browse ke C:\Program Files\ESRI\License\arcgis9x dan ubah nama 3 file yaitu: lmgrd.exe, lmutils.exe dan lmtools.exe menjadi nama lain atau ubah ekstensinya dengan .bak
6. Download versi terakhir file-file FlexLM dari http://www.globes.com/support/generic/utilities/fnp_utilities_download.htm
7. Ubah nama file-file yang baru didownload tersebut menjadi lmgrd.exe, lmutils.exe dan lmtools.exe untuk menggantikan versi yang lama
8. Buat file kosong dengan ekstensi .log pada direktori C:\Program Files\ESRI\License\arcgis9x (mis. flexlm.log)
9. Selanjutnya atur License Manager dengan men-dobel klik lmtools.exe (harus sebagai administrator). Masukkan kembali parameter-parameter yang diminta pada tab Config Services sesuai dengan kondisi sebelumnya (masing-masing lmgrd.exe, license.lic/.dat, dan flexlm.log dari direktori C:\Program Files\ESRI\License\arcgis9x)
10. Beri tanda cek pada pilihan Services and then Start Server at Power Up kemudian klik pada Save Services
11. Anda sudah selesai dan tinggal me-restart komputer
12. Bila sudah reboot, atur kembali lisensi ArcGIS anda melalui Desktop Administrator bila ArcGIS belum dapat menemukan License Manager/Servicesnya

Dokumentasi ini sudah berhasil dicobakan pada 2 notebook dengan platform Windows Vista (Toshiba M500 dan Sony Vaio Tipe CR).

Sumber:
ESRI's FAQ
http://support.esri.com/index.cfm?fa=knowledgebase.techarticles.articleShow&d=34020

Getting license manager to work as a service in Vista 32 and 64 bits (Diego Puga)
http://forums.esri.com/Thread.asp?c=93&f=1148&t=241545&mc=7

So, after a few tries, I came up with the map event handler - but this doesn't work as the events that you get relate to drawing on the map (see http://esri.com/news/arcuser/1005/files/eventdriven.pdf  - in particular for a list of the events that can be triggered from a map and http://www.esri.com/news/arcuser/0404/files/productivity.pdf for how to use the map event handler).

So the solution seems to be use the Editor event handler.  For some examples of how this works, see:

• http://forums.esri.com/Thread.asp?c=93&f=987&t=140048
• http://support.esri.com/index.cfm?fa=listserve.messageShow&m=45390

La OGC es una organización formada por más de 362 compañías, gubernamentales y universidades que participan en consenso en el desarrollo de interfaces que faciliten el acceso a datos geoespaciales.

Las especificaciones más importantes surgidas del OGC son:

• GML - Lenguaje de Marcado Geográfico.
• WFS - Web Feature Service o Servicio de entidades vectoriales que proporciona la información relativa a la entidad almacenada en una capa vectorial (cobertura) que reúnen las características formuladas en la consulta.
• WMS - Web Map Service o Servicio de mapas en la web que produce mapas en formato imagen a la demanda para ser visualizados por un navegador web o en un cliente simple.
• WCS - Web Coverage Service
• CSW - Web Catalogue Service o Servicio de catálogos interfaz común para el descubrimiento, búsqueda y consulta de metadatos relacionados a datos, servicios y recursos de tipo geográfico.

Servicios como WMS pueden ser utilizadas con un navegador estándar realizando peticiones en forma de URLs, pero existen varios software para SIG que ya cuentan con este servicio con la ventaja de agregar información local y utilizar las herramientas del mismo.

Vamos a pasar de la teoría (aburrido) a la práctica y en esta ocasión lo haremos con ArcGIS Desktop 9.2 y con la dirección de servicios WMS de INEGI.

Abrimos ArcMap y creamos un nuevo mapa.

Buscamos el icono de ArcCatalog y la damos clic.

Una vez abierto la ventana de ArcCatalog damos clic en Gis Servers en la lista de la izquierda y luego en Add WMS Server.

En la ventana que aparece escribimos:

http://antares.inegi.gob.mx/cgi-bin/map4/mapserv_orto?

En la URL y hacemos clic en Get Layers.

Cuando se conecte al servidor aparecerán los Layer con que cuenta este servicio, le damos en OK.

Inmediatamente se agregara un link en la ventana de Gis Servers eso quiere decir que todo esta correcto y lo podemos abrir como layers en ArcMap.

Cerramos ArcCatalog y damos clic en el icono de Add Data.

Buscamos el link realizado y abrimos haciendo clic en Add.

El resultado será el mosaico de ortofotos que tiene INEGI de todo el país escala 1:20,000 con una resolución de 3m.

Did you ever install ArcGIS Server Java first and then go ahead and change the host name of the machine only to realize now the you will have to either re-install or run post install or contact support to fix ArcGIS Server.

Did you ever have an disk image with ArcGIS Server Java installed and configured, then you go ahead and ghost the image on many machines only to realize that all the hostnames are the same.

Don't worry, In this post you will find information on what files has got the entries of the host name and for what purpose. This will also give you a good understanding of how ArcGIS Server Manager and Web Services Handler uses these configuration files.

Note: These files are for version 9.2, I will update the post shortly after the 9.3 is released.

The five files of concern are:

C:\Program Files\ArcGIS\server\system\Server.dat
C:\Program Files\ArcGIS\java\manager\service\tomcat\managerserver\webapps\arcgismanager\WEB-INF\classes\manager_client.properties
C:\Program Files\ArcGIS\java\web_output\services\WEB-INF\classes\arcgis_wshandler.properties
C:\Program Files\ArcGIS\java\manager\service\lib\manager_config.properties
C:\Program Files\ArcGIS\java\manager\config\applications\build\build.properties

1.  <ArcGIS Install Dir>\server\system\Server.dat

This files stores the actual name of the machine where the SOM is running. Also here the URL's to the virtual directories such as the arcgisjobs, arcgisoutput and arcgiscache is set. If your ArcGIS Services are not previewing correctly in ArcCatalog or if the web service end point url's are shown incorrectly than you should check this file. You can edit this file in any text editor, but once you make any changes to this file be sure to restart the ArcGIS Server processes (both ArcGIS Server Manager and  ArcGIS Server Object Manager).

2. <ArcGIS Install Dir>\java\manager\service\tomcat\managerserver\webapps\arcgismanager\WEB-INF\classes\manager_client.properties

I am not sure on the importance/functionality of this file, but this file has one hostname attribute to startup the manager web application with the correct host name.

3. <ArcGIS Install Dir>\java\web_output\services\WEB-INF\classes\arcgis_wshandler.properties

This is a pretty important configuration file. This file has all the details needed including the hostname of where the SOM is installed for the Web Services handler to initialize. So if you are unable to log into manager and also get an HTTP 503 error when you access the services wsdl (http://machinename:8399/arcgis/services?wsdl) then you need to make sure this file has the right entries. There is nice knowledge base article on this issue and here is the link.

4. <ArcGIS Install Dir>\java\manager\service\lib\manager_config.properties

This file defines a host name parameter to indicate to the manager tomcat instance as to where to start the new tomcat instance to host all the webapps (port 8399)

5. <ArcGIS Install Dir>\java\manager\config\applications\build\build.properties

This file both a URL and SERVER properties which has a hostname entry primarily used by the manager web application to deploy the web application.

Few tips to make your life easier:

• If you are creating an image to ghost then instead of using the machinename try using localhost both during the install and post-install of ArcGIS Server. This way the image is portable and no changes are needed
• If you are using Windows XP then make sure you have turned the built in firewall off (this prevents the DCOM from making the necessary connections) and also make sure the Simple File Sharing is turned off. This is enabled by default and you will have to manually turn this off, its best done i nthe image so that you will not have to do this for every ghosted machine. (How: My Computer -> Tools -> Folder Options -> View -> Advanced Settings -> All the way to the bottom)

Hoje com o desenvolvimento de sensores de alta resolução os mapeamentos ficaram muito mais precisos, no entanto os produtos de alta resolução ainda são extremamente caros e não são acessíveis à maioria dos usuários de sensoriamento remoto ou SIG, uma “solução” para isso é fazer um dos processos mais usados para se obter imagens com resoluções melhores que as disponíveis no mercado, esse processo é a Fusão de Imagens. As técnicas de fusão permitem integrar a maior resolução espacial da banda pancromática à maior resolução espectral das demais bandas, produzindo imagem colorida que reúne ambas as características. Sendo assim, Hoje tentaremos dar uma demonstração do processo no ArcGIS 9.2.

Materiais de apoio:

FUSÃO DE IMAGENS POR IHS PARA MELHORAR A IDENTIFICAÇÃO DE USO DO SOLO EM ELEMENTOS AMOSTRAIS.

A INFLUÊNCIA DOS MÉTODOS DE REAMOSTRAGEM NA FUSÃO DE IMAGENS LANDSAT-5 TM E SPOT PANCROMÁTICA.

Por: Luis Sadeck

Knp saya lebih memilih ArcGIS, Tadi na saya disuruh belajar menggunakan Autocad, tapi rekomendasi dari temen kerja, seorang anak geologi untuk menggunakan ArcGis..

Instalasi ArcGIS 9.2final :

1. klik folder LIsence yang tlah didownload..pilih LMsetup, lalu klik.

2. Setelah itu sprt biasa anda tinggal next2 aja pilihan na, pilih yang custom.

3. Setelah selasai, copy foldel crack yang ada didownload anda, kedalam folder ArcGIS tempat anda menarus instalan, Mis : di C:/Programfiles/Arcgis, paste aja, otomatis file crack yang ada di istalan akan ke replace..

4. setelah itu, klik di program- Arcgis - Lisense manager , disini kita akan mengaktifkan linsense manager na dari crack yang kita copy td, jida sudah dimasukkan maka akan keluar status succses,

5. Lalu liat di folder donlotan ArcGIS na pilih icon setup.exe, klik maka prosess instalan selesai.

Untuk menjalankan :

1. pilih program, --> ArcGIS --> ArcMap

2. Setelah itu klik new , mualilah kita membuat peta..

3. di ArcGis ini kita dapat menAdd data berupa database, baik itu berbentuk shape atau Line..Beda sprt menggunakan autocad, kita mengambil file yang sudah ada, tinggal kita buat layer2 pengganungan gambar na. klu di ArcGis, jika data sudah siap maka dengan gampang kita kan mengambil souce na..

4.

Setelah itu :

Selamat Mencoba -saya jg masih dalam tahan belajar-

ArcGIS Desktop en sus diferentes licencias es el software más usado en el mundo, por su capacidad de análisis espacial, gestión de datos, visualización y fácil uso, además de las nuevas herramientas que integra ArcGIS en sus últimas versiones como ArcReader, ArcMap, ArcCatalog, ArcToolbox, ArcScene y ArcGlobe.

Sí, lo sé. Todo eso se escucha muy bien cuando te lo vienen a ofrecer, pero cuando te dicen el precio te das cuenta que no puedes costearlo (y mucho menos más de una licencia).

Por ese motivo muchos usuarios (yo soy el primero) optan por SIG libre, que es una de las alternativas que se están popularizando entre los usuario con bajos recursos. Los SIG libres son software sin ningún costo y de código abierto, que nos ofrecen soluciones casi comparables con productos de paga y sin pagar un solo centavo con solo dar un clic podemos descargarlos de Internet, ¿perdón ya mencione que son gratis?

Pero el casi comparable es el problema, al no encontrar soluciones ó el resultado esperado comparado con los SIG de paga, optamos por la piratería, que en México casi no conocemos de eso (quise ser sarcástico). Muchas de las Instituciones educativas y empresas de negocios consiguen software pirata al no tener dinero para pagar uno original. En algunos países como México es de lo más normal ir al “tianguis” por un CD pirata que se venden por montones y a muy bajo costo, pero si tienes una conexión a Internet y un poco de paciencia también podrás hacerte de tu software pirata.

En Geomariguanadas quisimos ilustrar a nuestros lectores que es más fácil de conseguir SIG libre o SIG pirata.

Empecemos por el SIG libre.

Requerimientos:

Mozilla Firefox.

Una conexión a Internet.

Software a bajar: gvSIG.

El primer paso es ir a su buscador favorito en este caso es www.google.com y escribir gvSIG y hacer clic en buscar.

Segundo paso es entrar a la página oficial de gvSIG.

Tercer paso es buscar en la página principal el link que nos lleve a las descargas.

Cuarto paso es encontrar la versión estable y dar clic para empezar a bajar el Software.

Quinto paso es esperar a que se descargue e instalar.

¡Y listo ya tienes tu SIG libre en tan solo unos minutos!

SIG pirata.

Requerimientos:

Mozilla FireFox.

Plugins para firefox Torrent Finder Toolbar

Plugins para firefox FireTorrent

Una conexión a Internet.

Software a bajar: ArcGis 9.2

Primer paso es instalar los plugins Torrent Finder Toolbar (barra para buscar Torrents) y FireTorrent (motor de descarga P2P) a su FireFox. (Hay muchas maneras de bajar archivos Torrents, este solo es una forma).

Abrir FireFox y escribir en la barra de herramientas Torrent Finder Toolbar “ArcGis 9.2” y hacer clic en buscar.

Segundo paso hacer clic en algunas de las opciones que te muestra la página de resultados.

Tercer paso hacer clic en descargar y guardarlo en tu PC (FireTorrent tendrá que ser configurado antes).

Las redes P2P suelen ser un poco lentas así que te tomara unas horas o quizá un par de días depende de tu conexión a Internet.

Otra manera mas rápida es salir de tu casa ir a tu tienda de piratería favorita y comprarlo por una fracción del costo real.

Nota: Geomariguanada no difunde la piratería estos ejemplos solo son nada más que ilustrativos.

¿Así que es lo que prefieres Software libre o pirata?

Danau, baik itu buatan ataupun hasil dari suatu bendung dapat dihitung volume air yang terdapat dengan menggunakan modul sederhana pada perangkat lunak ArcView. ArcView adalah pendahulu dari perangkat lunak ArcGIS yang saat ini populer digunakan oleh pemain SIG di Indonesia.

Kembali ke pertanyaan: Bagaimana menghitung volume air danau? Ada dua pendekatan yang bisa dilakukan dan ini tergantung dari data dan atau proses terjadinya danau itu sendiri.

Kasus pertama adalah kelengkapan data kedalaman atau batimetri dari danau tersebut. Jika data ini ada maka persoalan akan menjadi lebih mudah.

Rekan Jimmy A Kadar, dengan menggunakan 3D Analyst dari perangkat lunak ArcView mencoba menghitung volume air danau Cirata yang terletak di Jawa Barat. (Lihat Danau Cirata di Google Maps, klik disini)

Jimmy menggunakan data batimetri yang didapat dari Limnologi LIPI, sehingga perhitungan dapat segera dilakukan. Langkah-langkah pengerjaan dapat disimak pada slide berikut ini:

[slideshare id=417157&doc=jimmyakadarvolofwatercirata-1211277357091436-9&w=425]

Pada kasus kedua, kita tidak mempunyai data batimetri dari danau yang ada. Kasus ini ditemui oleh rekan Ahmad Mauliddin saat akan menghitung volume danau Bili-Bili. Danau Bili-Bili terletak di Sulawesi Selatan dan merupakan danau yang terbuat dari hasil membendung sungai, serupa dengan danau Cirata. Sila liat danau Bili-Bili di Google Maps dengan klik disini.

Berhubung tidak ada data batimetri maka pendekatan yang digunakan Ahmad adalah menggunakan data sebelum danau ini terjadi. Artinya adalah dia mencari data topografi daerah Bili-Bili sebelum bendungan dibuat atau diaktifkan. Data topografi yang didapat kemudian didijitalkan ketinggiannya, barulah kemudian diproses dengan 3D Analyst ArcView. Batas danau dapat menggunakan batas saat ini (batas air).

Langkah-langkah proses dapat dilihat pada slide berikut ini:

[slideshare id=417159&doc=ahmadmauliddinvolofwaterinbilibili-1211277402195760-9&w=425]

Jadi, untuk menghitung volume air danau gak perlu menuangkan air danau ke suatu wadah dulu kan..?

: )

Hoje vamos mostrar uma dica bastante interessante para se trabalhar com imagens.
Você já deve ter passado algum tempo tentando ajustar os histogramas para que sua imagem fiquem pelo menos parecidas entre si no que diz respeito à contraste, brilho, saturação e outros, por isso, vamos mostrar como resolver esse problema sem muitos atropelos. Apresentaremos então, a técnica de Save Breakpoint ou copia de histograma.

Bom trabalho e até a próxima.

Por: Luis Sadeck

Voici donc concrètement ce qu'un utilisateur ENVI peut désormais faire:

• Lire et importer des données (vecteur et image) provenant de la Géodatabase d'ArcGIS

• Ecrire des données (vecteur et image) dans la Géodatabase d'ArcGIS. Ces données sont ainsi directement accessibles depuis l'environnement ArcGIS

• Envoyer vers ArcMap des données ENVI pour finaliser sa chaîne de traitements (création de rapport, mise en page, génération de produits cartographiques, etc.)

Enfin, côté ArcGIS, une extension ENVI pour le support du format NITF existe et permet aux analystes d'imagerie géospatiale d'accéder et de produire des données NITF dans les environnements ArcGIS Desktop et ArcGIS Server.

L'exemple ci-dessous illustre une chaîne de traitements complète réalisée à partir de quelques-unes de ces possibilités. Pour visualiser cet exemple en détail et en animation, cliquez ici.

1. Détection de changement réalisée à l'aide de l'assistant semi-automatique "SPEAR - Change Detection" d'ENVI sur deux images QuickBird (côte indonésienne avant et après le tsunami de 2004). Avec la méthode utilisée, les changements détectés sont mis en évidence dans une image en niveaux de gris (plus le changement est important, plus la valeur du pixel est forte et tend vers le blanc)

2. Extraction et vectorisation automatique des zones les plus dévastées à l'aide de l'outil Feature Extraction sur l'image de détection de changement précédemment obtenue

3. Export du résultat vers la Géodatabase pour des traitements ultérieurs

4. Une autre option possible: envoi du résultat sous ArcMap pour une mise en page cartographique

]]> http://geotecnologias.wordpress.com/?p=61 Tue, 06 May 2008 00:20:18 +0000 sadeckgeo http://geotecnologias.wordpress.com/?p=61

O programa do centro do desenvolvimento da ESRI (EDC) fornece o reconhecimento e o status especial aos departamentos das universidades que têm os programas bem fundamentados e focalizados em educar estudantes para projetar e desenvolver aplicações SIG usando a tecnologia ArcGIS desktop da ESRI.

Estudantes matriculados nos programas EDC, terão acesso especial ao software ESRI e terão possibilidades de ser reconhecidos pelas suas realizações.

Três Universidades foram aprovadas como locais de implantação de um EDC. Essa é uma oportunidade especial, que faz parte de uma nova concepção e desenvolvimento da tecnologia geoespacial.

Os três primeiros locais do EDC foram a Universidade de Redlands e de Claremont Graduate University, na Califórnia, bem como University College, em Londres, no Reino Unido.

Um EDC pode ser alojado em um departamento ou ser multidisciplinar, stand-alone GIS center. As grandes universidades podem precisar de mais de um EDC no campus, por isso, a ESRI está aceitando pedidos durante o período que vai até 15 de setembro de 2008, após este período, haverá matrículas duas vezes por ano, em janeiro e junho.

Para mais informações acesse:
http://www.esri.com/industries/university/edc/index.html

Here is the link (http://www.esri.com/software/arcgis/about/whats-coming.html)

Essa “ferramenta” permiti que o programador construa a plataforma shapefile em aplicações rápidas por causa da biblioteca API Visual Basic.

O aplicativo (biblioteca) é reconhecido pela ESRI e já foi bastante testado, tendo assim, seus pequenos problemas sanados.

Sobre Visual Basic: O Visual Basic é uma linguagem programação produzida pela empresa Microsoft, e é parte integrante do pacote Microsoft Visual Studio. A linguagem é dirigida por eventos (event driven), e possui também um ambiente de desenvolvimento integrado e totalmente gráfico, facilitando enormemente a construção da interface das aplicações. O Visual Basic é uma linguagem totalmente orientada a objetos.

Já para aqueles que trabalham com desenvolvimento JAVA a NVision tem o JShapeFile que é bastante versátil e dá suporte aos 14 tipos de Shapefile incluindo os 3D´s, um fator que deve ser levado em consideração pelos programadores é que Java já é extremamente popular e domina grande parte do mercado de aplicações corporativas.

Essa biblioteca tem inúmeros exemplos de códigos prontos dando mais agilidade ao trabalho.

Sobre JavaScript: O JavaScript é uma linguagem de programação criada pela Netscape em 1995, que a princípio se chamava LiveScript. Oferece tipagem dinâmica - tipos de variáveis não são definidos, é interpretada, ao invés de compilada, possui ótimas ferramentas padrão para listagens, oferece bom suporte a expressões regulares e outras. O JavaScript, apesar de ser usado há muito tempo quase que exclusivamente como linguagem de programação estruturada, também é uma linguagem de programação orientada a objetos poderosa.

Fonte: Wikipédia, NVision's, JulioGreff

O documento foi gerado originalmente pela empresa estadunidense NIMA (National Imagery and Mapping Agency) e posteriormente a base foi adquirida pela poderosa ESRI.

Segundo algumas informações, existem várias versões dessa base e até uma paga, que tem atualizações constantes feitas pela ESRI. A versão gratuita pode ser encontrada no site (http://www.maproom.psu.edu/dcw/)

Os temas da base são: limites políticos / Estradas / Curvas de Nível / Cidades e Localidades / Rios e Aeroportos, que podem ser visualizados sem problemas no ArcInfo e exportados para ArcView 3.x

Por: Luis Sadeck

Olá Peopleware, hoje estou passando aqui só para criar o link de um tutorial que fiz a um tempo e estava esquecido no meu HD Virtual.

Bem o tutorial fala um pouco sobre o recorte de imagens no ArcGIS 9.2, como muita gente está perguntando sobre esse processo nos grupos, resolvi disponibiliza-lo para a comunidade Geotecnológica.

Aguardem que brevemente estarei postando comentários e tutoriais sobre o ET GeoTools.

Um abraço a todos

Por: Luis Sadeck