Smart GIS Chat GPS Tracking Convert GIS Shape to Interactive Open Source HTML JS KML Web GIS GPS App: GIS Surface Analysis

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GIS Surface Analysis

A) Downloading (ASTER and SRTM) NASA Geo DEM Height Files

Open your Internet browser and go to the following URL to Download ASTER Geo DEM
http://www.gdem.aster.ersdac.or.jp/search.jsp
Open your Internet browser and go to the following URL to Download SRTM height files
http://dds.cr.usgs.gov/srtm/version2_1/SRTM3/

Convert (ASTER & SRTM) DEM to Tin Shape file

Menu → Tools → Convert (ASTER & SRTM) DEM to Tin Shape file

Convert ASTER Geo DEM to Color Value bmp file

Menu → Layers → Add Layer → Files of Type → TIFF → Open

Menu → Layers → Save Layer as → Change the File extension to → BMP → Save

Menu → Surface → Building Contours Surface(s) Analysis

Menu → Surface → Building Tin Surface(s) Analysis

Select Height Layer Name
Select Height Criteria (All Feature or Inside Selected Features or Outside Selected Features)
Select Height Field
Select Output Tin Surface Shape file name
Select Build Surface by Delaunay, if elevation points have unequal distances among them.
Select Build Surface by Matrix, if elevation points have equal distances among them.
Press Build

Building Contours Surface(s) Analysis

Menu → Surface → Building Contours Surface(s) Analysis

Check Use Height Layer as Tin Surface or Not
Select Height Layer Name
Select Height Criteria (All Feature or Inside Selected Features or Outside Selected Features)
Select Height Field
Select Contour Interval
Select Base Contour
Select Output Contour Shape file name
Select Build Surface by Delaunay, if elevation points have unequal distances among them.
Select Build Surface by Matrix, if elevation points have equal distances among them.
Select Do not build Surface, if Height layer is a Tin Surface
Press Build

Converting 2D to 3D Surface Analysis

Menu → Surface → Converting 2D to 3D Surface Analysis

Check Use Height Layer as Tin Surface or Not
Select Height Layer Name
Select Height Criteria (All Feature or Inside Selected Features or Outside Selected Features)
Select Height Field
Select Destination 2D GIS Shape File
Select Criteria of the Destination 2D GIS Shape File
Select Output 3D Shape file name
Select Build Surface by Delaunay, if elevation points have unequal distances among them.
Select Build Surface by Matrix, if elevation points have equal distances among them.
Select Do not build Surface, if Height layer is a Tin Surface
Press Convert

Calculate Area and Volume of Surface(s)

Menu → Surface → Calculate Area and Volume of Surface(s)

Check Use Height Layer as Tin Surface or Not
Select Height Layer Name
Select Height Criteria (All Feature or Inside Selected Features or Outside Selected Features)
Select Height Field
Select Height of the Calculating Plane
Select above Plane or Below Plane
Select Build Surface by Delaunay, if elevation points have unequal distances among them.
Select Build Surface by Matrix, if elevation points have equal distances among them.
Select Do not build Surface, if Height layer is a Tin Surface
Press Calculate