dominoc925

Google Mapplet for showing UTM grid zones

2012-01-30T13:40:00.000+08:00

The Universal Transverse Mercator (UTM) coordinate system is a grid based system for specifying locations on the earth's surface. UTM consists of 60 zones, each with its own local Transverse Mercator...

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Join a spatial table with a non-graphical table in gvSIG

2012-01-23T16:21:00.000+08:00

It is very useful to join a geospatial feature with a related non-graphical database table for analysis. This is a common feature found in commercial GIS applications like GeoMedia. I found a similar...

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Connect to non-graphical tabular database data in gvSIG

2012-01-16T15:08:00.000+08:00

Being used to commercial GIS software, I was looking around for the option to connect to a non-graphical database table in the gvSIG OADE 2010 application window. I failed to locate the command....

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Import a CSV text file into gvSIG

2012-01-09T14:54:00.000+08:00

Text files formatted as CSV (comma separated values) are a common data transfer method from system to system. In gvSIG, it is possible to import the CSV files into a binary DBF file through an easy...

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Google Gadget for creating ESRI World Files

2012-01-02T22:09:00.000+08:00

The ESRI World file is a text file used to georeference a corresponding image file. A detailed description of the format can be found in this Wikipedia page http://en.wikipedia.org/wiki/World_file....

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Google Gadget for monitoring crime incidents in Malaysia

2011-12-26T11:50:00.000+08:00

This is a Google Gadget for monitoring crime incidents in Malaysia; the incidents are posted by users of www.malaysiacrime.com. The gadget works by subscribing to the georss feed of...

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Accessing PostGIS database features from gvSIG

2011-12-19T16:33:00.000+08:00

The PostGIS spatial database can be accessed by a variety of client software including gvSIG, FME, and even Intergraph's GeoMedia. It is possible to import features from GeoMedia into the PostGIS...

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Add your own property field to Google Maps polygons

2011-12-12T12:47:00.000+08:00

The Google Maps Overlay classes such as the Polygon or Polyline classes have only standard properties including clickable, fillColor, paths, zIndex, etc. In certain circumstances, it is advantageous...

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How to find out the digitized line directions in gvSIG

2011-12-05T13:37:00.000+08:00

Sometimes it is useful to find out the direction the line work was digitized. It is possible to use the labeling function in gvSIG to display an indicator of the line direction as shown in the...

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Google Mapplet to readout UTM coordinates

2011-11-28T13:58:00.000+08:00

This Google Maps tool was written to show the local Universal Transverse Mercator (UTM) easting and northing values of any clicked point on Google Maps. To use this tool, Simply open up any...

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Move a feature to another layer in Global Mapper

2011-11-21T13:32:00.000+08:00

It is possible to move an existing geometry feature such as a polygon from one layer to another layer in Global Mapper. It is not as intuitive as it could be but it is certainly possible. Below is an...

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C# code snippet to read an Applanix SBET file

2011-11-14T13:40:00.001+08:00

The smoothed best estimated trajectory (SBET) file of an air survey flight created and exported by the Applanix PosPac software is a simple binary format. The SBET file is just a series of records...

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Clip a polygon with another polygon using Global Mapper

2011-11-07T13:29:00.000+08:00

In GIS data editing work, it may be useful to clip a polygon with another polygon in a simple boolean operation. Global Mapper can perform the clipping task using the Cut Selected Area(s) from...

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Passing Unicode strings between C# and C/C++ dynamic link libraries

2011-10-31T13:21:00.000+08:00

Passing simple data types like int, boolean, double between managed C# code and unmanaged C/C++ code is fairly straightforward. However, passing Unicode strings between them is a little more...

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Decompose polygon vertices to points in Global Mapper

2011-10-24T13:18:00.002+08:00

In Global Mapper, you can decompose the vertices of selected polygons into standalone point features. The process is basically a two part process - selected one or more polygons. Then select the...

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How to align the Facebook "like" button with Twitter and Google +1 buttons

2011-10-17T09:22:00.000+08:00

I recently added the Facebook, Twitter and Google Plus social network sharing buttons to a Google Mapplets web page. I found that while the Twitter and Google Plus buttons align properly, the...

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Set Coordinate Reference System for a grid file in SAGA GIS

2011-10-10T13:32:00.001+08:00

When an ESRI ArcGrid ASCII Grid file without an associated projection file (*.prj) is loaded into SAGA GIS, the grid data will be placed in a plain cartesian X and Y reference frame. If the...

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Create polygon centroids in gvSIG

2011-10-03T13:07:00.004+08:00

It is possible to use gvSIG to create polygon centroids but this is done indirectly through the use of add-on functionality from the Sextante tool box. Note that the centroid created will be at the...

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Create a thematic map with gvSIG

2011-09-26T14:38:00.000+08:00

Creating thematic maps based on one or more attribute fields of a geographical feature is a fairly typical GIS task. The free and open source software gvSIG has the tools to quickly generate a...

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Convert local date time to GPS week, seconds of week Google Gadget

2011-09-19T12:10:00.001+08:00

This Google Gadget calculator can convert the local date time values into the equivalent GPS week and seconds of week format. This came about since I found that in some situations, I need to find out...

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Passing structures between C# and C/C++

2011-09-12T10:39:00.001+08:00

Data structures can be passed between managed C# code and unmanaged C/C++ dynamic link libraries but it can be a little complicated. The trick is to define structures that match between the two...

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Google Maps tool for creating air photo frames

2011-09-05T13:40:00.004+08:00

In aerial digital photography, the area captured by the camera is dependent on a number of factors including the camera lens and sensor dimensions, the flying speed and height, and the capture...

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Listing the exported function names in a C/C++ dll

2011-08-29T13:09:00.003+08:00

I found myself working with some low level C/C++ API for some software to hardware interfaces. This can involve quite a bit of work figuring out function names, pointers, addresses and memory...

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Export ground points from a LAS file to ASCII CSV file using FME

2011-08-22T14:13:00.002+08:00

This is one of the typical LiDAR file conversion task - converting a LAS (*.las) file to an ASCII XYZ or CSV (*.csv) file. It can be done with any number of free and commercial software. It is a...

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Finding the Intergraph Host ID string for license generation

2011-08-15T14:22:00.000+08:00

In order to generate licenses for Intergraph GeoMedia products, a host id may be required as input to the license generation process. Whenever GeoMedia could not obtain a valid license, it will pop...

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