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BYSAJJAD ALICLASS NO (03)REG NO (09-PWCIV-3213)
Quantum GISWorking withRaster Data
Raster Data in QGIS      QGIS uses the GDAL library     to read and write raster data     formats , including Arc/Info    ...
Raster Data in QGIS* More than 100 raster formats are supported by the GDAL library.* A complete list is available at  htt...
Loading raster data in QGIS Raster layers are loaded either by click onLoad   Raster icon    OR by selecting   => Layer=...
RASTER CALCULATORThe Raster Calculator in theLayer menu allows to performcalculations on basis of existingraster pixel val...
FIELD LISTThe Fields list contains all loadedraster layers that can be used. To adda raster to the raster calculatorexpres...
RESULT LAYER In the Result layer section you have todefine an output layer. You can then definethe extent of the calculati...
OPERATORS SECTIONThe Operators section contains allusable operators. To add an operatorto the raster calculator expression...
03 sajjad ali -qgis working with raster
03 sajjad ali -qgis working with raster
03 sajjad ali -qgis working with raster
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03 sajjad ali -qgis working with raster

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GIS BY MUHAMMAD TOUSEEF CIVIL ENGINEERING UET PESHAWAR

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Transcript of "03 sajjad ali -qgis working with raster"

  1. 1. BYSAJJAD ALICLASS NO (03)REG NO (09-PWCIV-3213)
  2. 2. Quantum GISWorking withRaster Data
  3. 3. Raster Data in QGIS QGIS uses the GDAL library to read and write raster data formats , including Arc/Info Binary Grid, Arc/Info ASCII Grid , GeoTIFF , Erdas Imagine and many more. .
  4. 4. Raster Data in QGIS* More than 100 raster formats are supported by the GDAL library.* A complete list is available at http://www.gdal.org/formats_lis
  5. 5. Loading raster data in QGIS Raster layers are loaded either by click onLoad Raster icon OR by selecting => Layer=> Add Raster Layer
  6. 6. RASTER CALCULATORThe Raster Calculator in theLayer menu allows to performcalculations on basis of existingraster pixel values. The results arewritten to a new raster layer with aGDAL supported format
  7. 7. FIELD LISTThe Fields list contains all loadedraster layers that can be used. To adda raster to the raster calculatorexpression field, double click its namein the Fields list. You can then use theoperators to construct calculationexpressions or you can just type it intothe box.
  8. 8. RESULT LAYER In the Result layer section you have todefine an output layer. You can then definethe extent of the calculation area based on an input raster layer or based on X,Ycoordinates and on Columns and Rowsto set the resolution of the output layer.If the input layer has a different resolution,the values will be resampled with nearestneighbor algorithm.
  9. 9. OPERATORS SECTIONThe Operators section contains allusable operators. To add an operatorto the raster calculator expressionbox, click the appropriate button.Mathematical calculations ( + , - ,* . . . ) and trigonometric functions( sin, cos, tan, . . . ) are available.
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