HILL SHADED DIGITAL TERRAIN MODEL HOW TO

You can add other layers, such as land-use types, vegetation, roads, or streams, to further increase the informational content in the display. Create a shaded relief raster by combining elevation and hillshade rasters with transparency Hillshade output example Using hillshade for displayД«y placing an elevation raster on top of a hillshade raster and adjusting the transparency by using the Layer Transparency slider on the Appearance tab of the elevation raster, you can easily create a visually appealing relief map of a landscape. The hillshade example below has an azimuth of 315 degrees and an altitude of 45 degrees. Default sun altitude for hillshade is 45Вє Hillshade example The units are in degrees, from 0 (on the horizon) to 90 (overhead). The altitude is the slope or angle of the illumination source above the horizon. Default sun azimuth (direction) for hillshade is 315Вє Altitude The azimuth is the angular direction of the sun, measured from north in clockwise degrees from 0 to 360. The primary factor when creating a hillshade map for any particular location is the location of the sun in the sky. It can greatly enhance the visualization of a surface for analysis or graphical display, especially when using transparency.Д«y default, shadow and light are shades of gray associated with integers from 0 to 255 (increasing from black to white). It does this by setting a position for a hypothetical light source and calculating the illumination values of each cell in relation to neighboring cells. Click вЂњOkвЂќ.ДЄnd thatвЂ™s it! We have a simple topographic map (Figure 20).The HillShade tool obtains the hypothetical illumination of a surface by determining illumination values for each cell in a raster. Double click on вЂњSymbolвЂќ for the other values and choose the вЂњContour, Topographic, IntermediateвЂќ (Figure 19). Double click on вЂњSymbolвЂќ for our group of values and choose the вЂњContour, Topographic, IndexвЂќ (Figure 18). Right click on the our added values and choose Group values (Figure 17) Now we have to group the selected values. Choose the value field вЂњCONTOURвЂќ, click вЂњAdd ValuesвЂќ button and add heights (Figure 16). Go to вЂњSymbologyвЂќ tab, choose вЂњCategoriesвЂќ (Figure 15). Right click on the layer вЂњcontourвЂќ and select вЂњPropertiesвЂќ. Now we have a contour layer (Figure 14), but we need to mark our contours. Set the values what you want as it depends on your height accurancy of the DEM and your relief (high relief -> larger intervalls, low relief -> finer intervalls). In Spatial Analyst choose вЂњSurface analysisвЂќ > вЂњContourвЂќ (Figure 12, Figure 13). To make contours we need once more the Spatial Analyst tool. Now we need to make the contours (lines with the same height value). Now we have a nice image of the surface (Figure 11).

Go to the tab вЂњDisplayвЂќ and set the Transparency value 35 and click вЂњOkвЂќ (Figure 10). Click вЂњOkвЂќ (see Figure 7, Figure 8, Figure 9). Set the natural breaks values what you want but once again, default is fine. Now we have to specify the number of classes. Right click on the вЂњColor rampвЂќ and uncheck the вЂњGraphic ViewвЂќ. Right click on the layer вЂњDEMвЂќ and select вЂњPropertiesвЂќ. Turn to the classification of the relief. Choose the Stretch type вЂњStandard deviationsвЂќ (see Figure 6). Right click on the layer вЂњHillshadeвЂќ and select вЂњPropertiesвЂќ. Now we have a hillshade layer (Figure 5), but it looks like ther is no contrast. You can change these values to those that you want but sticking with the default values is good to go! We see some different values for angles of artificial light. So, we see вЂњHillshadeвЂќ window (Figure 4). In the Spatial Analyst tool select вЂњSurface analysisвЂќ and click on вЂњHillshadeвЂќ. To calculate hillshade, you must select the View menu > Toolbars > Spatial Analyst tool (Figure 2). We see the black-and-white image of the relief, the dark colors correspond to lower areas, bright colors correspond to higher elevations. So, we have a digital elevation model portion of the Penza region, Russia. With the choice of the model you decide for yourself which is best for you. You can use a digital elevation model SRTM or ASTER. But there are other digital terrain models, such as SRTM. Our map will display terrain and elevation marks (contours).ДЄs a digital elevation model I will ASTER GDEM v.2.

HILL SHADED DIGITAL TERRAIN MODEL HOW TO

For example, we see the elevation marks, vegetation, settlements and so on.Д«ut how to make topographic map itself? It is in this article, you will learn how to make a simple topographic map.ДЄll we need is a digital elevation model and ArcGIS (I use ArcGIS 9.3.1). On a topographic map, we see different objects, which are indicated by different symbols. So, we all know how a topographical map looks like.

Hill shaded digital terrain model