8.2.13.2 Altitude/DTM - LUPMISManual

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8. LUPMIS Tools > 8.2 Drawing Tools > 8.2.13 Other GIS Tools

8.2.12.2 Altitude / Digital Terrain Model (DTM)

Level of expertise required for this Chapter: Advanced; specifically for LUPMIS @ TCPD

a) Download point grid for DTM

b) Create DTM

c) Create contour map

d) Download spot heights / profile

e) Create raster altitude map

f) Create slope map

g) Create hillshade map

h) Create coloured alitude map

The 2 download tools described below require reliable Internet access to download data from the Google GIS web server.

a) Download Point Grid for DTM

There are many ways to create a Digitial Terrain Model (DTM). The easiest might be from a grid of altitude points, which can be downloaded from Google through a Google API: Drawing Tools > Other GIS Tools > Altitude / DTM > Download point grid for DTM:

> Enter the UTM coordinates of the bottom left (SW) corner of the grid to be downloaded > Select the number of readings (points). The maximum is approx. 1600 per day, i.e. a grid of 40 x 40 points, which takes some 80 minutes. > Select the distance between the points, which is determined by the scale of your work > Download, and wait the estimated time.

If your area is larger than the 40 x 40 x points, you have to continue after 24 hours.

The result shows in the Map Maker windows, described in LUPMIS:

b) Create DTM

In Map Maker, you can now create a DTM from these altitude grid points: Utilities > 3D surface utilities > Create surface > from Spot heights > Select ...alt_points... file > Z values are NOT stored in a separate database > Settings > Use closest value in 6 directions > Cell width: Distance between points in point DRA file> Save Surface > Define name of TER file > Save.

Create Contour Map

In Map Maker, you can create a contour map from the DTM: Utilities > 3D surface utilities > Export surface > As contours > Step 1 of 3: Choose source TER file > Step 2 of 3: Resolution: 10 samples per cell > Contour spacing: 3 or 5 m for large scale; more for small scale > Next step > Choose target file: Define name for DRA file > Save > Finish.

Examples of the result:

c) Create Contour Map

Examples of the result:

d) Download Spot Heights / Profile

You can also download spot heights for individual mapping or an altitude profile. This is limited to a number of 50. You can either create a line DRA file or enter the points manually: Drawing Tools > Other GIS Tools > Altitude / DTM > Download spot heights / profile > Select DRA file or enter point coordinates > Download:

Example for a profile (e.g. road profile):

- - - - -

Once you have a DTM, you can create a variety of altitude-related maps:

e) Create Raster Altitude Map

Drawing Tools > Other GIS tools > Altitude / DTM > Create altitude map

Examples of result:

Alternativ approach in Map Maker to create a TIF altitude bitmap from DTM: Utilities > 3D surface utilities > Create bitmap > Altitude > ... > No sunlight > Save as TIF file, with world file.

f) Create Slope Map

g) Create Hillshade Map

A hill shade map (raster, TIF file) can be created from altitude bitmap (TIF, created from DTM in Map Maker, recommended) or from JPG file (created in LUPMIS): Drawing > Other GIS tools > Altitude / DTM > Create hill shade map

Example of result:

Alternative approach in Map Maker to convert DTM to a slope bitmap: Utilities > 3D surface utilities > Create bitmap > Slope > Select DTM > Sidelight: Light by sun at specified bearing and elevation.

h) Create Coloured Altitude map

An alternative coloured altitude map (raster, TIF) can be created from altitude bitmap (created from DTM, in Map Maker), alternatively from JPG file (created in LUPMIS): Drawing > Other GIS tools > Altitude / DTM > Create coloured altitude map

Alternativ approach in Map Maker to create altitude bitmap: Utilities > 3D surface utilities > Create bitmap > Altitude: Define colours by Colours > by Palette.