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/

B)  Convert (ASTER and SRTM) NASA Geo DEM Height Files to Tin Shape File

Convert (ASTER & SRTM) DEM to Tin Shape file

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

• Download Tiff DEM file from http://www.gdem.aster.ersdac.or.jp/search.jsp
• Select and Enter Clip values of your Area Left Top point and Right Bottom point
• Press Convert

C)  Convert ASTER NASA Geo DEM to Color value bmp 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

• Open Aster Geo DEM Tiff file
• Save Layer as bmp file
• Press Identify at any point in image to get Elevation value

D)  Building Contours from ASTER NASA Geo DEM

Menu → Surface → Building Contours Surface(s) Analysis

E)  Building Tin Surface 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
  

F)  Building Contours Surface(s) Analysis

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

G)  Converting 2D to 3D Surface Analysis

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

H)  Calculating Area and Volume of Surface(s)

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

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