Converting between raster and vector formats allows you to make use of bothraster and vector data when solving a GIS problem, as well as using the variousanalysis methods unique to these two forms of geographic data. This increasesthe flexibility you have when considering data sources and processing methodsfor solving a GIS problem.

To combine a raster and vector analysis, you need to convert the one type ofdata to the other. Let’s convert the raster result of the previous lesson to avector.

Berikut tutorial membuat peta kemiringan lereng menggunakan software ArcGIS 10. Menampilkan Data Kontur. Setelah data kontur dibuka selanjutnya kita akan merubah data kontur menjadi data DEM. Caranya buka ArcToolbox – 3D Analyst – Raster Interpolation – Topo to Raster. Mengubah Data Raster Menjadi Vektor. Buka Conversion Tools. Converting between raster and vector formats allows you to make use of both raster and vector data when solving a GIS problem, as well as using the various.

The goal for this lesson: To get the raster result into a vector that canbe used to complete the analysis.

9.1.1. Follow Along: The Raster to Vector Tool¶

Start with the map from the last module, raster_analysis.qgs. There youshould have the all_conditions_simple.tif calculated during the previousexercises.

• Click on Raster ‣ Conversion ‣ Polygonize (Raster toVector). The tool dialog will appear.

• Set it up like this:

• Change the field name (describing the values of the raster) tosuitable.

• Save the shapefile under exercise_data/residential_developmentas all_terrain.shp.

Now you have a vector file which contains all the values of the raster, butthe only areas you’re interested in are those that are suitable; i.e., thosepolygons where the value of suitable is 1. You can change thestyle of this layer if you want to have a clearer visualization of it.

9.1.2. Try Yourself¶

Refer back to the module on vector analysis.

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• Create a new vector file that contains only the polygons wheresuitable has the value of 1.
• Save the new file as exercise_data/residential_development/ assuitable_terrain.shp.

9.1.3. Follow Along: The Vector to Raster Tool¶

Although unnecessary for our current problem, it’s useful to know about theopposite conversion from the one performed above. Convert to raster thesuitable_terrain.shp vector file you just created in previous step.

• Click on Raster ‣ Conversion ‣ Rasterize (Vector toRaster) to start this tool, then set it up as in the screenshot below:

• Input file is all_terrain;
• Output file.. isexercise_data/residential_development/raster_conversion.tif;
• Width and Height are 837 and 661,respectively.

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The size of the output image is specified here to be the same as theoriginal raster which was vectorized. To view the dimensions of an image,open its metadata (Metadata tab in the LayerProperties).

• Click OK on the dialog to begin the conversion process.
• When it is complete, gauge its success by comparing the new raster with theoriginal one. They should match up exactly, pixel for pixel.

9.1.4. In Conclusion¶

Converting between raster and vector formats allows you to widen theapplicability of data, and need not lead to data degradation.

9.1.5. What’s Next?¶

Daniele luppi milano download torrent 2017. Now that we have the results of the terrain analysis available in vectorformat, they can be used to solve the problem of which buildings we should considerfor the residential development.