Z factor hillshade arcgis software

Generally, hillshade dems are clearer if the basic elevation layer is multiplied by 2 or 3. The input dem is multiplied by the z factor before calculating shadows. The zfactor is a scaling factor used to convert the elevation values for two purposes. It is not uncommon to perceive the output from hillshade as looking peculiar if the. Not setting the zfactor correctly makes the hillshades look heavy or leaden. Home creating 3d visualizations in arcmap using hillshade. Hillshade one direction 315 degrees top and hillshade one direction 45 degrees bottom comparison of popular gis software by availability of blending modes colour hypsometric tint with two. These values will be processed with calculations for slope and aspect to determine the final hillshade value for each cell in the output raster. Specific azimuth and altitude angles are set and a zfactor to convert z units in feet to meters. By default, a grayscale color ramp is used to display a hillshaded elevation model. Open hillshade, hillshade window is appears select elevation layer and output layer, output format default is geotiff is ok, type z factor 300. Ensure the zfactor is 1 because our x,y and z values are all in meters. The zfactor adjusts the units of measure for the zunits when they are different from the x,y units of the input surface. The hillshade raster has an integer value range of 0 to 255.

The zfactor parameter is in many spatial analyst and 3d analyst tools. I understand that the z value has to be converted to degrees using a z factor of. Determine what the middle latitude of the area of interest is. This zfactor adjustment method is cumbersome to implement with latitudelongitude. The surface area and ratio arcgis extension enables you to generate raster datasets of surface. Here we present several techniques which combine hillshade with other relief data layers derived from dem and. The hillshade tool creates a shaded relief raster from a raster. If the model shadows option is disabled unchecked, the output raster only considers local illumination angle. In this case changing the z factor to 2 will multiply the input dem by 2. Using arcmap hillshade command to simulate 3 dimensional images. To calculate the shade value, first the altitude and azimuth of the illumination source are needed. Hello, i have a question about z factors and how to use them within a slope analysis and hillshade function. This zfactor adjustment method is cumbersome to implement with latitude longitude.

If the x,y units and zunits are in the same units of measure, the zfactor is 1. X and y are in decimal degrees while z is in meters. Relief visualization techniques using free and open source gis tools. The arcgis software suite has many useful capabilities for handling geospatial data including. The zvalues of the input surface are multiplied by the zfactor when calculating the final output surface. I have been with esri in software products since 1994. Pdf relief visualization techniques using free and open. The usgs hydrosheds program is in the process of deriving good. Create a hillshade raster of the base dem dem03, in this example using the spatial analyst tools.

The zfactor is a conversion factor that adjusts the units of measure for the. Configure the options for rendering, then click apply hillshade. It is the number of ground x,y units in one surface zunit. If the z units of the data being used are feet, first use the raster calculator to multiply the raster by the conversion factor 0. Setting the z factor parameter correctly arcgis blog. Hillshadeslope analysis and z factors geonet, the esri. The standard format for elevation data in gis is a digital elevation model dem in raster format.