Importing ASCII Grid Data into GIS/Image processing software
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1 Importing ASCII Grid Data into GIS/Image processing software Table of Contents Importing data into: ArcGIS 9.x ENVI ArcView 3.x GRASS
2 Importing the ASCII Grid data into ArcGIS 9.x Go to Table of Contents
3 Example File : GRID.MOD13A2.asc MODIS ASCII Subsets: Data Visualization [MOD13A2] Terra Vegetation Indices (NDVI, EVI) USA, Walker Branch Watershed, Oak Ridge, Tennessee Centered on Latitude [ ] Longitude [ ] 7 Kilometers [7 Pixels] Wide and 7 Kilometers [7 Pixels] High Requested Time Span November 2005 to November 2005 For a PRJ file, access For a prj.adf file, access MODIS HDF Tile MOD13A2.A h11v hdf -----START Scientific Data Set (Band): 1_km_16_days_NDVI, MODIS Date: A (Nov. 1, 2005)----- ncols 7 nrows 7 xllcorner yllcorner cellsize nodata_value END Scientific Data Set (Band): 1_km_16_days_NDVI, MODIS Date: A (Nov. 1, 2005)----- MODIS HDF Tile MOD13A2.A h11v hdf -----START Scientific Data Set (Band): 1_km_16_days_NDVI, MODIS Date: A (Nov. 17, 2005)----- ncols 7 nrows 7 xllcorner yllcorner cellsize nodata_value END Scientific Data Set (Band): 1_km_16_days_NDVI, MODIS Date: A (Nov. 17, 2005)-----
4 Step 1 Copy contents between -----START Scientific Data Set (Band).. And -----END Scientific Data Set (Band)... Into a separate file. If there are more than one START-END entries, copy contents within each of the START-END statements into individual files like: File GRID_MOD13A2_A _1_km_16_days_NDVI.asc from example file GRID.MOD13A2.asc ncols 7 nrows 7 xllcorner yllcorner cellsize nodata_value
5 Step 2 Importing the individual file GRID_MOD13A2_A _1_km_16_days_NDVI.asc into ArcGIS : Using ArcToolbox from ESRI s ArcGIS 9.x software Select: Conversion Tools To Raster ASCII to Raster
6 Step 3 Provide path to ASCII file (GRID_MOD13A2_A _1_km_16_days_NDVI.asc ) and Output Raster (MD13A205305) Click OK
7 Step 4 After converting to Raster the output raster (MD13A205305) would automatically load into ArcMap
8 Step 5 Export this file (MD13A205305) into ArcGIS GRID Right Click on the file to Export Provide output filename (e.g. md13a ) and format
9 Step 6 Setting up the projection Download file prj.adf from copy the prj.adf file into the GRID file directory (md13a ) created in the previous step
10 Step 7 Load the GRID file in ArcMap Make sure that the projection is defined on the dataset Final output md13a with projection set, overlaid with the MODIS site locations If the projection isn't defined, use the following file to define the projection. Download file modis.prj from Copy this file into <ESRI installation Folder>\Coordinate Systems\Projected Coordinate Systems\World\Sphere-based and manually set the projection for the file
11 Importing the ASCII Grid data into ENVI 4.x Go to Table of Contents
12 Example File : GRID.MOD13A2.asc MODIS ASCII Subsets: Data Visualization [MOD13A2] Terra Vegetation Indices (NDVI, EVI) USA, Walker Branch Watershed, Oak Ridge, Tennessee Centered on Latitude [ ] Longitude [ ] 7 Kilometers [7 Pixels] Wide and 7 Kilometers [7 Pixels] High Requested Time Span November 2005 to November 2005 For a PRJ file, access For a prj.adf file, access MODIS HDF Tile MOD13A2.A h11v hdf -----START Scientific Data Set (Band): 1_km_16_days_NDVI, MODIS Date: A (Nov. 1, 2005)----- ncols 7 nrows 7 xllcorner yllcorner cellsize nodata_value END Scientific Data Set (Band): 1_km_16_days_NDVI, MODIS Date: A (Nov. 1, 2005)----- MODIS HDF Tile MOD13A2.A h11v hdf -----START Scientific Data Set (Band): 1_km_16_days_NDVI, MODIS Date: A (Nov. 17, 2005)----- ncols 7 nrows 7 xllcorner yllcorner cellsize nodata_value END Scientific Data Set (Band): 1_km_16_days_NDVI, MODIS Date: A (Nov. 17, 2005)-----
13 Step 1 Copy contents between -----START Scientific Data Set (Band).. And -----END Scientific Data Set (Band)... Into a separate file. If there are more than one START-END entries, copy contents within each of the START-END statements into individual files like: File GRID_MOD13A2_A _1_km_16_days_NDVI.asc from example file GRID.MOD13A2.asc ncols 7 nrows 7 xllcorner yllcorner cellsize nodata_value
14 Step 2 Open ENVI and select the Open External File Generic Formats ASCII command
15 Step 3 Select the file GRID_MOD13A2_A _1_km_16_days_NDVI.asc A message box similar to one shown above should display The Number of samples and Lines in this message box should match with the Requested Data Area Click OK
16 Step 4 After the image has been loaded into display Edit the header information to set the Projection parameters Right click on the file Edit Header Select Edit Attributes Map Info
17 Step 4 Set the projection parameters using the GRID_MOD13A2_A _1_km_16_days_NDVI.asc file Pixel Size is the Cell Size from the ASCII file GRID_MOD13A2_A _1_km_16_days_NDVI.asc Easting is the xllcorner Northing is the yllcorner Image Coord X is and Image Coord Y is (nrows +1)
18 Step 5 Change Projection to sinusoidal Click OK twice to display image and export the file into any format of choice In the above step If the sinusoidal projection isn't defined, use the following file to define the projection. Download file modis.prj from
19 Importing the ASCII Grid data into ArcView 3.x Go to Table of Contents
20 Example File : GRID.MOD13A2.asc MODIS ASCII Subsets: Data Visualization [MOD13A2] Terra Vegetation Indices (NDVI, EVI) USA, Walker Branch Watershed, Oak Ridge, Tennessee Centered on Latitude [ ] Longitude [ ] 7 Kilometers [7 Pixels] Wide and 7 Kilometers [7 Pixels] High Requested Time Span November 2005 to November 2005 For a PRJ file, access For a prj.adf file, access MODIS HDF Tile MOD13A2.A h11v hdf -----START Scientific Data Set (Band): 1_km_16_days_NDVI, MODIS Date: A (Nov. 1, 2005)----- ncols 7 nrows 7 xllcorner yllcorner cellsize nodata_value END Scientific Data Set (Band): 1_km_16_days_NDVI, MODIS Date: A (Nov. 1, 2005)----- MODIS HDF Tile MOD13A2.A h11v hdf -----START Scientific Data Set (Band): 1_km_16_days_NDVI, MODIS Date: A (Nov. 17, 2005)----- ncols 7 nrows 7 xllcorner yllcorner cellsize nodata_value END Scientific Data Set (Band): 1_km_16_days_NDVI, MODIS Date: A (Nov. 17, 2005)-----
21 Step 1 Copy contents between -----START Scientific Data Set (Band).. And -----END Scientific Data Set (Band)... Into a separate file. If there are more than one START-END entries, copy contents within each of the START-END statements into individual files like: File GRID_MOD13A2_A _1_km_16_days_NDVI.asc from example file GRID.MOD13A2.asc ncols 7 nrows 7 xllcorner yllcorner cellsize nodata_value
22 Step 2 Open ArcView and activate the Spatial Analyst extension
23 Step 3 Invoke Import Data Source tool Select ASCII Raster file type Select the ASCII raster file GRID_MOD13A2_A _1_km_16_days_NDVI.asc and import it as a Theme into the View.
24 Importing the ASCII Grid data into GRASS Go to Table of Contents
25 Example File : GRID.MOD13A2.asc MODIS ASCII Subsets: Data Visualization [MOD13A2] Terra Vegetation Indices (NDVI, EVI) USA, Walker Branch Watershed, Oak Ridge, Tennessee Centered on Latitude [ ] Longitude [ ] 7 Kilometers [7 Pixels] Wide and 7 Kilometers [7 Pixels] High Requested Time Span November 2005 to November 2005 For a PRJ file, access For a prj.adf file, access MODIS HDF Tile MOD13A2.A h11v hdf -----START Scientific Data Set (Band): 1_km_16_days_NDVI, MODIS Date: A (Nov. 1, 2005)----- ncols 7 nrows 7 xllcorner yllcorner cellsize nodata_value END Scientific Data Set (Band): 1_km_16_days_NDVI, MODIS Date: A (Nov. 1, 2005)----- MODIS HDF Tile MOD13A2.A h11v hdf -----START Scientific Data Set (Band): 1_km_16_days_NDVI, MODIS Date: A (Nov. 17, 2005)----- ncols 7 nrows 7 xllcorner yllcorner cellsize nodata_value END Scientific Data Set (Band): 1_km_16_days_NDVI, MODIS Date: A (Nov. 17, 2005)-----
26 Step 1 Copy contents between -----START Scientific Data Set (Band).. And -----END Scientific Data Set (Band)... Into a separate file. If there are more than one START-END entries, copy contents within each of the START-END statements into individual files like: File GRID_MOD13A2_A _1_km_16_days_NDVI.asc from example file GRID.MOD13A2.asc ncols 7 nrows 7 xllcorner yllcorner cellsize nodata_value
27 NAME r.in.arc - Convert an ESRI ARC/INFO ascii raster file (GRID) into a (binary) raster map layer. (GRASS Raster Data Import Program) SYNOPSIS r.in.arc r.in.arc help r.in.arc input=name output=name [title="phrase"] [mult=multiplier] DESCRIPTION r.in.arc allows a user to create a (binary) GRASS raster map layer from an ESRI ARC/INFO ascii GRID file with (optional) title. OPTIONS Parameters: input=name Name of an existing ASCII raster file to be imported. output=name Name to be assigned to resultant binary raster map layer. title="phrase" Title to be assigned to resultant raster map layer. mult=multiplier Multiply all raster cell values by multiplier. multiplier is a floating point value, and has a default value of 1.0. The input file has a header section which describes the location and size of the data, followed by the data itself. The header has 6 lines: ncols: nrows: xllcorner: yllcorner: cellsize: or alternatively (not supported in r.in.arc, but in r.in.gdal): ncols: nrows: xllcenter: yllcenter: cellsize: NOTES r.in.arc handles floating point cell values. The mult option allows the number of significant figures of a floating point cell to be increased before importing. Multiples of ten are the most functional multipliers. SEE ALSO r.in.gdal r.out.arc Source:
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