Difference between revisions of "Visualizing a land cover map of Fort Ord, California"
From CCoWS Wiki
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+ | == Outcomes == | ||
+ | *Render Fort Ord in a 3d realistic virtual reality | ||
+ | *Use your land cover map to populate the visualization with trees and shrubs where appropriate | ||
+ | |||
== Prerequisites == | == Prerequisites == | ||
*Fort Ord land cover map | *Fort Ord land cover map | ||
*Habitat classification chart | *Habitat classification chart | ||
− | *[Tarsier Installation|Download and install Tarsier] | + | *[[Tarsier Installation|Download and install Tarsier]] |
− | == | + | == Intorduction == |
− | + | In your remote sensing class (external link perhaps?) you have developed and ground truthed a land cover map. . . | |
− | # | + | |
+ | |||
+ | |||
+ | == Simplify the land cover map == | ||
+ | Your land cover map has too many classes for our purposes. We will want to reclassify the map distilling the classes down to just three: trees, shrubs, and other. This process could be done in other programs as well, but here is how it is done in Tarsier: | ||
+ | # Open Tarsino | ||
# Open your Fort Ord land cover map: | # Open your Fort Ord land cover map: | ||
− | ## File->Open | + | ## File->Open |
− | ## | + | ## Navigate to your land cover map and double click the file |
# Open the Raster Lookup tool: | # Open the Raster Lookup tool: | ||
## File->New->Tools->Raster Lookup | ## File->New->Tools->Raster Lookup | ||
− | ## | + | # Load the land cover map into the Raster Lookup |
+ | ## In the Raster Lookup view, use the drop down box next to '''Input Raster:''' to select your land cover map | ||
+ | # Click the '''Find Values''' button | ||
+ | # To the right of '''Lookup Table Data:''', click the '''View''' button. This will display a table with a column, '''Input''', for all the values from the input raster (your land cover map) and another column, '''Output''', that will dictate the new values for the reclassified map. | ||
+ | # Reclassify the map. | ||
+ | ## Right now the "Output" column is filled with "-9999" which is the default null value. This will be the value of your "Other" class. | ||
+ | ## For any input value that represents forest or trees, edit the corresponding output value by typing a "1" into the cell. | ||
+ | ## For any input value that represents shrubs or chaparral, give the output value a "2". | ||
+ | # After you have finished editing the table, click the '''Execute''' button on the Raster Lookup view. | ||
+ | # View and save your reclassified raster | ||
+ | ## To the right of '''Output Raster 0:''' click the '''View''' button | ||
+ | ## Save the raster: With the Raster View window active, File --> Save As. . . Save your raster to an apropriate location. Tarsino will recognise file names up to 255 characters (no spaces)0, so name your file something informative like "'Original file name'_ReclassifiedTo.Trees.Shrubs.Other.'yymmdd'.tra" | ||
+ | |||
+ | |||
+ | == Creating RasterSymbolScheme == | ||
+ | The reclassified map has three classes, one of which is null (Other). You now need to let Tarsier know how you want these to be visually represented in a render. One way to do this is to create a [[Tarsier: Raster Symbol Scheme|symbol scheme]]. | ||
+ | # |
Revision as of 15:25, 13 November 2009
Contents
Outcomes
- Render Fort Ord in a 3d realistic virtual reality
- Use your land cover map to populate the visualization with trees and shrubs where appropriate
Prerequisites
- Fort Ord land cover map
- Habitat classification chart
Intorduction
In your remote sensing class (external link perhaps?) you have developed and ground truthed a land cover map. . .
Simplify the land cover map
Your land cover map has too many classes for our purposes. We will want to reclassify the map distilling the classes down to just three: trees, shrubs, and other. This process could be done in other programs as well, but here is how it is done in Tarsier:
- Open Tarsino
- Open your Fort Ord land cover map:
- File->Open
- Navigate to your land cover map and double click the file
- Open the Raster Lookup tool:
- File->New->Tools->Raster Lookup
- Load the land cover map into the Raster Lookup
- In the Raster Lookup view, use the drop down box next to Input Raster: to select your land cover map
- Click the Find Values button
- To the right of Lookup Table Data:, click the View button. This will display a table with a column, Input, for all the values from the input raster (your land cover map) and another column, Output, that will dictate the new values for the reclassified map.
- Reclassify the map.
- Right now the "Output" column is filled with "-9999" which is the default null value. This will be the value of your "Other" class.
- For any input value that represents forest or trees, edit the corresponding output value by typing a "1" into the cell.
- For any input value that represents shrubs or chaparral, give the output value a "2".
- After you have finished editing the table, click the Execute button on the Raster Lookup view.
- View and save your reclassified raster
- To the right of Output Raster 0: click the View button
- Save the raster: With the Raster View window active, File --> Save As. . . Save your raster to an apropriate location. Tarsino will recognise file names up to 255 characters (no spaces)0, so name your file something informative like "'Original file name'_ReclassifiedTo.Trees.Shrubs.Other.'yymmdd'.tra"
Creating RasterSymbolScheme
The reclassified map has three classes, one of which is null (Other). You now need to let Tarsier know how you want these to be visually represented in a render. One way to do this is to create a symbol scheme.