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  • Welcome to my presentation - “ArcHydro for ArcGIS 10”. My name is Brent Kastor from RS&H. Hopefully you have found yourself to be in the correct room and you are ready to delve into the wide world of drainage and creating data for use in drainage analysis. This afternoon I will try to solve your drainage issues (if you happen to have drainage issues) and to possibly enlighten you to some of the uses of LiDAR data.
  • I will begin the presentation by providing a brief introduction of who I am – where I have been and my qualifications.I will then give a quick run-down of RS&H – what our qualifications are.I will follow the run-down with the “meat” of the presentation – Establishing Terrain for use in ArcHydro, Creating Basins, and LiDAR Resources.There will be some time at the end of the presentation for questions, but feel free to ask questions during the presentation as well (just raise your hand). I can not promise I will be able to field all questions on the spot, but I can take down your information and will get back to you asap with an answer.
  • With offices across the United States, RS&H works in a variety of geographies and on a variety of projects – you can see here we have quite a few offices in Florida, but we have grown to cover the East Coast, the Midwest, and the West Coast. From major interstate planning and construction to airport terminal and runway planning and construction, we are certainly “Improving Your World” (and of course this animation was created in Esri’s 3D Analyst).
  • With offices across the United States, RS&H works in a variety of geographies and on a variety of projects – you can see here we have quite a few offices in Florida, but we have grown to cover the East Coast, the Midwest, and the West Coast. From major interstate planning and construction to airport terminal and runway planning and construction, we are certainly “Improving Your World” (and of course this animation was created in Esri’s 3D Analyst).
  • Within RS&H, we have GIS staff in nearly every office (which we have nearly 40 offices). We have more than 70 staff with GIS skills (avid users of ArcGIS Desktop) and a dozen or so GIS Power Users.
  • GIS is used on nearly every task we tackle. Here you can see our crew performing data collection for eventual GIS analysis.
  • For this project, we needed GIS for an Environmental Analysis for a bridge replacement project.
  • In Aviation, GIS can be used to assist with the creation of a Noise Contour Map.
  • Right near our headquarters in Jacksonville, FL, we were hired to analyze relationships between employment and population.
  • We use GIS on quite a few projects. Many of our construction projects RS&H works begin with one common issue – Drainage.  You can see in this graphic, we used ArcHydro as part of the process to calculate the infiltration rate and storage capacity of the landscape’s surface. Multiple data layers were included in this analysis.There are several tools available to our Professional Engineers for analyzing drainage – but it seems we use ArcHydro often.  In this presentation, you will see how to establish terrain for ArcHydro and use ArcHydro to delineate basins.
  • I would like to take a moment to see – by a show of hands - How many have created a TIN / DEM / worked with LiDAR data or ASCII files?
  • Before getting too far into the presentation, you will notice that the screen captures are from ArcGIS Desktop 10. For the sake of ArcHydro, we still have several staff hanging tight onto ArcGIS 9.3.1 – since ArcHydro for ArcGIS Desktop 10 is still very much in Beta (as of the last time I looked). We have had many issues with ArcHydro for ArcGIS Desktop 10 – this is because ArcHydro is developed through a partnerships. Also, it is common to want to use HEC-GEORAS or GEOHMS. These products are produced by the US Army Corp of Engineers and are not yet compatible with ArcGIS Desktop 10. I would look online on the US Army Corps website for the latest information.With that being said…the terrain functions work very nicely, since those functions rely on ArcGIS 10 3D Analyst.When establishing Terrain, you will need some input data - .las data is the most common for us, but you will often times receive various sources of elevation data. You can use any Arc-license – View/Editor/Info, but you definitely need a 3D Analyst license.
  • As I mentioned, there are various sources of data. For today’s presentation, we will be using .las data. The first thing we do is create a new File Geodatabase and feature dataset. We need to create these ahead of time so we have a place to import our .las data. It is important, when creating your feature dataset, to modify your Z coordinate linear unit – this is often times overlooked. By default, the unit is set to meter. We simply switch this to “Foot_US”.
  • There are several Key Items to know about your data prior to importing it into your geodatabase.Do you know your coordinate systems?What is the accuracy of the data?Do the points include just the bare earth – first return/last return?Click!Once you know this information, you can use the ArcMap search to search for the Las to Multipoint tool. I simply searched on LAS and the tool was the first one on the list.
  • Here is the “LAS to Multipoint” window.When importing the .las file, they may need to be processed in separate batches if they are too cumbersome.Simply specify your file geodatabase for the output.For point spacing – you need to check the metadata. If in doubt, put 4 (4 ft is what we have seen as the norm in many of our projects)Input Class – this is where you can extract bare earth (if the.las file you have contains multiple categories). In general, bare earth is class 2.If you assumed an average point spacing earlier you can open this multipoint feature class in ArcGIS and use the measure tool to verify that the assumption was reasonable.
  • Once your .las data is imported, you can move to create the terrain data. I did this in ArcCatalog by right clicking on my feature dataset and clicking on “New >” Terrain data layer. The “New Terrain” wizard opens and allows you to specify a few options.
  • You can see the newly created Terrain data layer.Since not all tools or extensions work with the Terrain Data Layer – it is a good idea to generate a TIN from the Terrain data layer.When converting, be careful not to exceed the TIN size limitation. If you have more than 20 million points, ArcGIS may not be able to produce a TIN with a resolution of 0 (which is no “thinning” applied).In this slide, you can see the Terrain data layer in the background and the Tin in the foreground. I used the Toolbox tool – Terrain to TIN.
  • To add additional analyses abilities to your arsenal, it is a good idea to create a raster out of the terrain data layer as well. You can do this easily by using the Terrain to Raster ArcToolbox tool. We have found if you use the default Sampling Distance Cell Size, your results could become wildly inaccurate. We like to choose 5ft.At this point, we have a Terrain Data Layer, a TIN, and a Raster Data Layer.All of the pieces of data we created will prove very valuable when performing various calculations or analysis.
  • Lets move on to use the data we just created to create Basins!
  • The first step to the process is to add a water polygon and your terrain raster. If you do not have a water polygon data layer, it would be a good idea to create one.The Terrain Raster can be floating point (allow decimals) or integer.The raster cell size should be small enough to capture smaller basins – 5 feet or smaller is a good cell size in Florida – and Florida is pretty flat.You might have noticed that we tend to get crazy interpolative results when we process LiDAR over water. We can fix that using ArcHydro – “Level DEM” command and our water polygon data layer.
  • Here you can see the Level DEM command hard at work.The water body polygon will need to have an elevation field. If yours does not, just add an elevation field and calculate the elevation to “0”.Notice that the water areas in the raster now look much more like water 
  • The next step is to fill depressions that have a drainage area smaller than our goal size. Sink Prescreening allows us to fill those depressions using a size we specify.You need to enter the drainage area in square feet if your raster is in feet and square meters if your raster is in meters.Once the process completes, there will be two new layers – PreFillDEM and Sink.
  • We are now ready to actually create the basins. To create the basins, we will use ArcHydro’s Sink Evaluation tool. You can see the tool on this slide being accessed through the ArcHydro toolbar.I used the prefilled raster as the DEM and named the Sink Polygon and Sink Drainage Area.If you would like to get various minimum drainage areas, you can repeat this process.In this case, the basins look pretty good, but there are obviously too many basins. You will need to break out the elbow grease 
  • In order to edit the drainage areas, I exported my Drainage Areas to my geodatabase and named it Basins.There are clearly areas that need to be merged. There may also be areas/polygons that need to be cut as well.We need to repeat this process until we are satisfied with out areas. After merging/cutting/and just general editing you might want to create topology to make sure all of your polygons are topologically correct. Once everything is clean, your basins are complete!
  • Next we will look at some various LiDAR or data resources currently available. More than likely, there are additional resources than what I am presenting here since new GIS data layers are constantly being made available.
  • The NOAA website is an excellent website or resource for LiDAR data.
  • Here is the USGS LiDAR website.I have found this site pretty easy to use. You simply zoom to the area of interest and fill in a few specifics about the format and coordinate system you would like. Immediately after submitting your request, you receive a window letting you know you will receive an e-mail notification when the data was ready.You receive the e-mail, downloaded the file and are instantly able to work with the data.
  • The South Carolina DNR is a great GIS data resource. You will need to create a free account to access the site, but once you do, you can download gads of various data.Besides the SCDNR, we mustn't forget about the local governments as a source of data. The local governments often are the best resource for current and accurate data.

Transcript

  • 1. RS&HArcHydro for ArcGIS 10Solving Your Drainage IssuesBrent Kastor, GISP
  • 2. RS&H - GISAgenda Introduction About RS&H, Inc. Establishing Terrain for Use in ArcHydro Create Basins LiDAR Resources Questions?
  • 3. RS&H - GISAgenda Introduction About RS&H, Inc. Establishing Terrain for Use in ArcHydro Create Basins LiDAR Resources Questions?
  • 4. RS&H - GISBrent Kastor, GISP –brent.kastor@rsandh.com Degree in Geography – Illinois State University State and Local Government for 13+ years Esri SAG Award Recipient (Horry County –2006) Experienced in SDE administration, WebProgramming (Flex/Silverlight), ProjectManagement, GIS integration/best practices,and all things spatial
  • 5. RS&H - GISAgenda Introduction About RS&H, Inc. Establishing Terrain for Use in ArcHydro Create Basins LiDAR Resources Questions?
  • 6. RS&H - GISAbout RS&H, Inc.
  • 7. RS&H - GISAbout RS&H, Inc.
  • 8. RS&H - GISGIS Qualifications @ RS&H GIS staff in multiple offices across the U.S. 70+ staff with GIS skills (use GIS on a regularbasis) 12+ GIS Power Users (advanced skill sets inGIS)
  • 9. RS&H - GISJacksonvillePortProjectCrew collects data for calculations on howmuch dredge material capacity remained fordeepening the river.
  • 10. RS&H - GISGIS as a Planning Tool Supports All Stages of aPlanning Project◦ Defining the Problem◦ Defining FeasibleAlternatives◦ Evaluating AlternativeSolutions◦ EstablishingRecommendations• Supports Design PhaseEnvironmental Analysis, Topsail IslandBridge Replacement Project, NC
  • 11. RS&H - GIS
  • 12. RS&H - GISGrowth ScenariosReality Check First Coast, North East Florida Regional Council
  • 13. RS&H - GISRS&H Tampa used ESRI’sArcHydroto calculate the infiltration rateand storage capacity ofthe landscape’s surface.
  • 14. RS&H - GISAgenda Introduction About RS&H, Inc. Establishing Terrain for Use in ArcHydro Create Basins LiDAR Resources Questions?
  • 15. RS&H - GISEstablishing Terrain for Use inArcHydro You will need .LAS data, ASCII, LiDAR geodatabase,etc. You will also need a 3D Analyst license Terrain can be prepared using ArcView/Editor/Info
  • 16. RS&H - GISSet Up Your Geodatabase We Use a File Geodatabase
  • 17. RS&H - GISImport LAS Data Key Items to Know About Your Data- horizontal/vertical coordinate systems- point spacing- only bare earth points included?
  • 18. RS&H - GISImport LAS Data (cont.)
  • 19. RS&H - GISCreate Terrain Data Layer
  • 20. RS&H - GISConvert Terrain to TIN
  • 21. RS&H - GISConvert Terrain to Raster
  • 22. RS&H - GISAgenda Introduction About RS&H, Inc. Establishing Terrain for Use in ArcHydro Create Basins LiDAR Resources Questions?
  • 23. RS&H - GISCreate Basins for Depressional TerrainUsing ArcHydro You will need ArcHydro, Spatial Analyst, aTerrain Raster, and ArcInfo (only for topologycorrection – otherwise View or Editor are fine)
  • 24. RS&H - GISAdd Terrain Raster and Water BodyPoly
  • 25. RS&H - GISLevel DEM…
  • 26. RS&H - GISSink Prescreening…
  • 27. RS&H - GISPreliminary Basins!
  • 28. RS&H - GISPreliminary Basins! (cont.)
  • 29. RS&H - GISAgenda Introduction About RS&H, Inc. Establishing Terrain for Use in ArcHydro Create Basins LiDAR Resources Questions?
  • 30. RS&H - GISLiDAR Resources http://csc-s-maps-q.csc.noaa.gov/dataviewer/viewer.html
  • 31. RS&H - GISLiDAR Resources http://lidar.cr.usgs.gov/LIDAR_Viewer/viewer.php
  • 32. RS&H - GISLiDAR Resources http://www.dnr.sc.gov/gis.html
  • 33. RS&H - GISQuestions?Brent Kastor, GISPGIS Administrator, RS&H, Inc.Brent.Kastor@rsandh.comOffice: 904.256.2373Mobile: 904.307.7075