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| − | As the name implies, a Tarsier Raster Data file (.tra) is Tarsier's gridded data format. It is made up of two parts: 1) an ASCII header file that specifies the structure of the grid and data properties, and 2) a series of data values stored as binary numbers.
| + | #Redirect: [[Tarsier Raster Data (tra)]] |
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| − | A typical Tarsier header looks like:
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| − | Cols 25
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| − | Rows 25
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| − | XLLCorner 0
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| − | YLLCorner 0
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| − | CellWidth 1
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| − | CellHeight 1
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| − | NoDataValue -9999.000000
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| − | Projection latlon
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| − | Precision float
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| − | Format binary
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| − | *
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| − | This raster is a 25 X 25 pixel lat/long grid with the lower left corner located at the intersection of the prime meridian and the equator. The resolution is 1 degree. Data points are stored as floating point numbers and the value -9999 represents no data.
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| − | The size of the raster is limited by the memory of your machine, but most modern computers can easily handle raster up to 49,000,000 pixles (7,000 x 7,000).
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| − | Tarsino has a peculiar fondness for UTM grids, but other projections are also supported:
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| − | -add table of projections-
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| − | The following precisions are available:
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| − | -add table of precissions-
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| − | ==Working with Raster Data==
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| − | You can do basic manipulations and analyses of raster data using [[Tarsier: Raster operations | operations]] in the Raster drop down menu. To access this menu, a raster viewer window must be active (selected). Selected operations will then only apply to the active raster.
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| − | For more advanced manipulations and analyses you can use various tools, analysts, or models (see below).
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| − | ==Learn more about rasters and how to work with .tra files==
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| − | Take the [[Tarsier tutorial: Raster data | Tarsier tutorial for Raster data]].
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