Kontur adalah garis khayal yang menghubungkan titik-titik yang memiliki ketinggian yang sama. Kontur dapat memberikan informasi relief baik secara relative maupun secara absolut. Pembuatan kontur dapat dilakukan dengan berbagai macam cara, salah satunya adalah memunculkan data ketinggian dan kontur dari data DEM (Digital Elevation Model). Untuk membuat dan memunculkan data ketinggian dan DEM. Tutorial dibagi menjadi 3 bagian, yaitu cara memotong citra di ArcGIS, cara memotong data shp, dan cara memotong gabungan berbagai data tidak secara permanen. Memotong peta sering diperlukan untuk analisa atau penyajian data suatu wilayah yang lebih kecil dari data aslinya. Misalnya saya ingin membuat peta citra suatu desa tertentu.
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ILSI Konversi Raster ke VektorConverting 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.The goal for this lesson: To get the raster result into a vector that canbe used to complete the analysis. Follow Along: The Raster to Vector ToolStart with the map from the last module, rasteranalysis.qgs. There youshould have the allconditionssimple.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 exercisedata/residentialdevelopmentas allterrain.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. Follow Along: The Vector to Raster ToolAlthough unnecessary for our current problem, it’s useful to know about theopposite conversion from the one performed above. Convert to raster thesuitableterrain.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 allterrain;.
Output file. Isexercisedata/residentialdevelopment/rasterconversion.tif;. Width and Height are 837 and 661,respectively.
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