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

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 ​

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Menu → Surface → Building Contours Surface(s) Analysis

E) Building Tin Surface Analysis​

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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

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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



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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


تسجيل منظومة سمارت جى اى اس ايتيدا Smart GIS Registeration in ITIDA
https://login.itida.gov.eg/ViewProfileFull.aspx?ID=2814

شهادات منظومة سمارت جى اى اس Smart GIS Certificates
https://drive.google.com/folderview...Z6SXJuOUdfdFp6amMyQURHSlYxZUoyR0U&usp=sharing​

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