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Quick Guide How to Use GPS Garmin eTrex Series

I've demonstrated how to create a vector grid in ArcGIS using Hawth's Analysis Tools extension. Unfortunately the extension can not be used in ArcGIS 10. If you are also users of ArcGIS 10, I recommend using an extension of www.ian GeoWizards ET-ko.com to create a vector grid. This extension is also available for ArcGIS version 9.x.

vector grid ArcGIS 10

The following steps to create a vector grid in ArcGIS extension 10 using GeoWizards ET.

1. Download and install GeoWizards ET.

2. Enable extensions ET GeoWizards in ArcMap toolbar.

3. Add Layer Area of Interest (AOI), which would made it a vector grid. Make sure the layers have been added has been in the projection define it, so have the file *. PRJ

4. Run ET GeoWizards. Here is a look GeoWizards ET window, select Basic -> Vector Grid, then click G0

5. Wizards of the first is to determine the source of reference for the outer limit of the grid to be created. You can choose the outer boundary outer boundary layer AOI or ArcMap data view by selecting Current View.

6. Then specify the name of the output vector of the grid, click Next

7. Next determine the input and output coordinate system. If you have been on the AOI layer define the previous projection, then you do not need to change anything here. Unless you want to output it has a coordinate grid system with different inputs, then click the button Select the output coordinate system.

8. Underneath you are required to determine the type of grid, polyline or polygon. Adjust to your needs, click Next.

9. In the past the Wizards, you can change the outer limit of the grid by checking the output and then assign the value XMin Change - ymin (lower left) and XMax - ymax (top right). If you do not want to change, leave without unchecked.

10. Underneath you determine the length and width of the grid as needed. Click Finish.

11. The result as shown in the picture at the top.

Create Vector Grid Extension in ArcGIS 10 Use GeoWizards ET

Creating a Watershed in Global Mapper 12

One new feature in Global Mapper 12 in addition to the feature to download data ASTER GDEM is a Generate Watershed or create a watershed (catchment). This new feature can be found via the menu File -> Generate Watershed.

via dominoc925.blogspot.com
Data needed to make a watershed in Global Mapper 12 is a raster data grid. You can download the SRTM data or GDEM ASTER data directly from Global Mapper 12 is to exercise. Examples of the above picture using LIDAR data.

Here below are the settings Watershed Generation Options window.

If necessary, you can change the value of the X-axis and Y-axis on the resolution settings. The greater the fill value, the smaller the resolution obtained, the consequence is the process generates a faster flow of the river, but the results obtained was not optimal (often the result is not as expected, for example of the visualization of raster data streams are clearly visible, but the flow is not in generate / not created for the flow)

In the process of making watershed in ArcGIS, we know the process of filling sinks, nah Depression Fill Depth is the same as the process of filling the sinks, where the Global Mapper will control how deep of a basin for "patched" before the basin is considered as a part of the watershed. If you do not want this process, fill with value 0, it will speed up data processing.

If you just want to get the flow of the river course, un-check the Create Watershed Areas Showing Drainage to Streams. If you check the option, in addition to the flow of the river, you'll also get a watershed in the form of polygons. Every time I tried to make the river flow following the watershed of his, I always cancel it, because it takes a very long time. I recently tried to stage produce a flow of the river course. The result as shown in the picture at the top. Maybe you want to try it? I recommend using the data with a minimum area, so that the process is faster.

Open Source GIS gvSIG 1:11 Portable

Open Source GIS gvSIG 1:11 newest version is now available in portable format to be run directly from USB Flash Disk, or you can also copy to your computer to be operated without the need installation at all. 1:11 gvSIG portable is available for Windows and Linux.

Previously I've posted about some open source GIS software portable and portable GPS in GIS this blog, including QuickGrid Portable, Portable OziExplorer, MapSource Portable, Portable Floppy GIS, as well as the most complete is the Portable GIS Archaeogeek V2 of the package is included in QGIS (with GRASS plugin), uDIG, gvSIG for desktop GIS and Mapserver, OpenLayers, Tilecache, Featureserver, and GeoServer for web applications.

Open Source GIS gvSIG contained in V2 Portable GIS is a long version, the latest is gvSIG version 1.11. Total size after unzipping about 285 MB. This portable format not only contains the program file to run gvSIG, but also the Java Runtime Engine, so if the computer you use to run gvSIG portable Java is not installed, this software can still use. gvSIG is made based on Java.

If you run gvSIG portable for the first time, the default language used is Spanish, because it's open source software is made in Spain. To change the language to Bahasa follow the following steps (see picture below):

Run the program gvSIG portable
From the menu "Ventana" select "Preferencias".
From the window that opens click the + on the "General", then select "Idioma".
Choose the language diingkinkan (Bahasa), click "Aceptar", restart the program gvSIG portable

Idiot Guide Learning PostGIS

PostGIS, which currently has a written version 1.5.2, is a spatial database extender for PostgreSQL Database Management System, which is used as a backend spatial database for geographic information systems (GIS), such as ESRI SDE or Oracle's Spatial extension. Unlike the two last-mentioned database servers, PostGIS is an open source GIS software under the GNU General Public License.

If you just want to start studying PostGIS, BostonGIS has made PostGIS and PostgreSQL tutorials on its website. For starters, maybe you could start with the Getting Started With PostGIS: An almost Idiot's Guide.

There is more guidance to learn the PostGIS on the site, please look at his homepage to find other tutorials PostGIS and PostgreSQL.

BostonGIS has also released a book PostGIS in Action in hardcopy and PDF format. I've posted previously about this book in May 2009. Now the book has many revisions, a more complete discussion and thicker, last updated in April 2011. PDF format of the book is actually a lot of "scattered" on the internet for download through file sharing sites

Image Rectification Using ArcGIS

Create a post yesterday GIS Image Download results of Google Maps utilizing the tools available in Global Mapper to perform image rectification. You could also use ArcGIS to perform rectification of satellite images or images downloaded from Google Maps.

In the video tutorials below show how to perform image rectification by taking the reference coordinates using Google Maps utilizing Maps Labs - LatLng Marker. Same manner used in previous tutorials.

With reference coordinates from Google Maps, you are shown how to do the rectification in ArcGIS using the Georeferencing tool. Learn more about video on how to perform image rectification in ArcGIS