![]() Then click on SelectÆProjected Coordinate SystemÆState Systems and click on “NAD 1983 Texas Centric Mapping System Albers.prj”. The input raster is smdem_raw already added to ArcMap, name the output raster as smdem, choose the output coordinate system by clicking at the button next to the input text-box to get the following form: In ArcToolbox, select Data Management ToolsÆProjections and TransformationsÆRasterÆProject Raster as shown below:ĭouble click on “Project Raster” to get the following form: Click on the ArcToolbox button in ArcMap to add ArcToolbox as a dockable window. Therefore, the first step is projecting the data to a coordinate system. This is because the DEM is in geographic coordinates. Look at the bottom-right corner of the document to see the geographic coordinates. When a new ArcMap document is created, it does not have any coordinate system, and its coordinate system is defined by the first dataset added to the map document. The added file will then be listed in the Arc Map Table of Contents. In the dialog box, navigate to the location of the data select the raster file smdem_raw containing the DEM for San Marcos and click on the “Add” button. Load the data to ArcMap Click on the icon to add the raster data. You can leave the default settings if they are pointing to the same directory where the ArcMap document is saved. ![]() #Arc hydro tools download series#The location of the vector, raster, and time series data can be explicitly specified using the function ApUtilities > Set Target Locations. By default, the new raster data are stored in a subdirectory with the same name as the dataset or Data Frame in the ArcMap document (called Layers by default and under the directory where the project is stored). All vector data created with the Arc Hydro tools will be stored in a new geodatabase that has the same name as the stored project or ArcMap document (unless pointed to an existing geodatabase) and in the same directory where the project has been saved (your folder for Ex3). Data Setup The existing NHD data to be used in this exercise are stored in a geodatabase and loaded in the map. ![]() However, the Spatial Analyst Extension needs to be activated, by clicking Tools > Extensions…, and checking the box next to Spatial Analyst. These toolbars need to be loaded though if you want to use any general functionality that they provide (such as general editing functionality or network tracing). Note that it is not necessary to load the Spatial Analyst, Utility Network Analyst, or Editor tools because Arc Hydro Tools will automatically use their functionalities on as needed basis. You can leave it floating or you may dock it in ArcMap. You should now see the Arc Hydro tools added to ArcMap as shown below. In the Customize dialog that appears, check the Arc Hydro Tools box. If the Arc Hydro Tools menu does not appear in the list, click on “Customize” (Scroll down the list to see “Customize”). Right click on the menu bar to pop up the context menu showing available tools as shown below.Ĭheck the Arc Hydro Tools menu. Create a new empty map, and save it as Exercise.mxd (or any other name – Ex3 is the name used in this tutorial). Inside NHD.mdb, you will be interested in NHDFlowline and NHDPoint feature classes stored in Hydrography feature dataset. Data.zip contains a data folder with the raw DEM named smdem_raw (from the NED – National Elevation Dataset of the United States), and a geodatabase named NHD.mdb (National Hydrography Dataset). ![]() ![]() The data files used in the exercise consist of DEM grid for the San Marcos Basin in Texas and the hydrography data. #Arc hydro tools download zip#Main Steps Exploring the DEM … Developing Terrain Preprocessing:ĭEM Reconditioning Fill Sinks Flow Direction Flow Accumulation Stream Definition Stream Segmentation Catchment Grid Delineation Catchment Polygon Processing Drainage Line Processing Drainage Density EvaluationĪrcHYDRO / Watershed and Stream Network DelineationĪvailable Data The data are provided in the accompanying zip file, Data.zip. The utility of the Arc Hydro tools is demonstrated by applying them to develop attributes that are useful for hydrologic modeling. Raster analysis is performed to generate data on flow direction, flow accumulation, stream definition, stream segmentation, and watershed delineation. The Arc Hydro tools are used to derive several data sets that collectively describe the drainage patterns of the catchment. You will perform drainage analysis on a terrain model for the San Marcos Basin. #Arc hydro tools download how to#Goals of the Exercise The purpose of this exercise is to illustrate, step-by-step, how to use the major functionalities available in the Arc Hydro tools for Raster Analysis. Tutorial: Watershed and Stream Network Delineation _ ArcHYDRO: GIS for Water Resources Source: Center for Research in Water Resources, University of Texas at Austin ![]()
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