Remote Sensing

how to export .hdf to .dem?…working with ER Mapper-GlobalMapper-ArcView

special gift to Arief at ITS, and I’m so sorry I’ve taken few days for it..ngapunten ya Rief..

Bismillahirrahmnirrahiim..let’s begin

just open your ER Mapper, GlobalMapper, and ArcView..

first we work on ER Mapper

1)In ER Mapper, go to File – Open

2) Select “All supported files” in the File open dialog box

3) By now you should see your source .hdf and .met files

4) Open the .hdf file

5) Save the resulting single band, pseudolayer image as “Geotiff”

6) In the “Save as” dialog, set the output type to “Multilayer”, and “Signed16bit”, and select the “Delete output transforms” box. Also go to “options” and select “Save Geotiff information”

7) Save the file.

Note: Now you have two options, one is to continue in ER Mapper, the other is to go to Global mapper.

8)Reopen the .tif, and open the algorithm window

9) Add intensity layer (Edit – Add raster layer – Intensity)

10) Change colour table of your pseudolayer to pseudocolor, under the “Surface” tab

11) Turn on sun shading on the intensity layer and rename the intensity layer to ‘Shading’. Clip the surface, and save your now colourful looking DEM as an algorithm

Global Mapper (If you reopen the .tif in ER Mapper, it will still look like a single pseudolayer unless you add an intensity layer with the .tif in the same surface, but if you reopen in Global Mapper, it will contain the height information of a DEM)

Now, we will work on GM

12) Open tif in Global Mapper and click “yes” when Global Mapper asks if it is a DEM

13)Export as USGS DEM (only with licensed GlobalMapper…hehehe)

HDF Import wizard in ER Mapper

In ER Mapper, go to Toolbars – Batch processing – HDF Wizard

1)       Choose: Import one file – Next

2)       Select your .met file

3)       Tick the “Produce .ers raster image” box

4)       Click the folder icon, and select output directory

5)       Write file name and select output as “Geotiff”

6)       Make sure the extension becomes .tif, otherwise manually correct this

7)       Continue the wizard… (select 30m cell size for an Aster DEM)

8)       When import is finished, you can open this Geotiff in Global Mapper for example

in Global Mapper

9)       When Global Mapper asks for the characteristics, click “Yes”, this will force it to read the height data

10)   Export as USGS DEM (only with licensed Global mapper)

Note: If the HDF import wizard crashes, producing the error: …….met “is not an hdf file, or is not a supported product” try changing your .met extension into .hdf.met, so for example ‘Aster1203090.met’ becomes ‘Aster1203090.hdf.met’

Now load your ArcView

1)   File – Extensions – activate 3D analyst and Spatial Analyst

2)   File – Import data source – select USGS DEM

3)   Create contours of your DEM (your created grid). Surface – create contours

4)   Decrease the delay in contour display by removing contour intervals you do not often use from the legend (but keep them in the file so you do not need to repeat this procedure if you change your mind)

That’s all. GOOD LUCK YOOO!!!

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