Digital Terrain Modeling with AutoCAD® Map 3D Dan Stover, Technical Marketing Manager, GBU, Autodesk Gene V. Roe, Surveying and Mapping Product Manager, GBU, Autodesk
Session ID GS314-3 This session will focus on the use of the new AutoCAD Map 3D digital terrain modeling (DTM) capability, combined with online data services, to analyze potential routes for a proposed pipeline extension. The benefits of WMS will be explored as well as Map 3D support for georeferenced raster imagery.
About the Speakers: Gene Roe Gene is a licensed surveyor and professional engineer in the U.S., with a Ph.D. in engineering. His background includes teaching, building a consulting surveying/GIS business, and working in the software business for the past 20 years. He has experience with remote sensing and holds two patents in the GPS field. Gene is currently a Map 3D Product Manager responsible for the surveying and mapping solutions
[email protected] Dan Stover Dan has over 23 years of experience with Autodesk products, starting with AutoCAD 2.16. Over the years he has worked in surveying, engineering, education, utility and public works environments, and has held a variety of CADD, GIS production, and management positions. Dan is currently the Technical Marketing Manager for the Geospatial Business Unit and focuses on AutoCAD Map 3D and Raster Design.
[email protected]
Digital Terrain Modeling with AutoCAD Map 3D
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Digital Terrain Modeling with AutoCAD Map 3D
Course Overview This course will feature AutoCAD Map 3D and the recently released Surveying Tool industry kit being used to support the location and geospatial analysis of a proposed cross country utility corridor, for example a pipeline project. The goals of the session are to inform and educate attendees on the capability of the software, and provide an opportunity to exchange ideas on how best to accomplish key tasks in the hypothetical workflow.
Surveying tools The session will begin by working with the recently released Surveying Tools kit. This kit is available at no charge to subscription customers from the subscription center. It is also available to everyone as a free 30 trial at http://www.autodesk.com/surveyingtools. The Surveying Toolkit has five major features:
• • • • •
Surface creation – digital elevation model (DEM) Import of ASCII points directly into a drawing Additional coordinate geometry (COGO) commands Export of surface to LandXML API
The Surveying Tools kit provides the ability to import 3D points, including LiDAR data, in order to create a digital elevation model or DEM. Once the DEM is created all of the stylization tools available in Map 3D, such as hill shading and draping of imagery can then be applied to support visualization and analysis of the project terrain. This is of significant value in making decisions about the location of the proposed utility corridor.
The mock study In order to begin the corridor study, a search of the publicly available data sources will be undertaken. With the proposed project being located in the US, the most appropriate working scale for the early stages of the design will be 1:250K, since the USGS DRGs are readily available for the entire country at this scale. Map 3D can access online data libraries via WMS – Web Mapping Services. This standard Internet protocol supports live connections to online map libraries can make the use of this data source seamless from inside Map 3D. Connection to an online map library using WMS will be demonstrated. At 1:250K a number of alternative route locations will be examined using the DRGs and the publicly available imagery. Also available for the entire US is a DEM at a 30m grid posting. Proposed route centerlines can be laid out, and adjusted in Map 3D taking into account terrain, land use, bodies of water, existing transportation corridors, etc. Once a reasonable number of possible alternatives have been developed, it will be appropriate to move to a more detailed project scale. In the process of developing this study we have found several interesting and potentially WMS sites. We will focus on data provided at: http://terraservice.net/ogccapabilities.ashx A listing of others is included below:
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Digital Terrain Modeling with AutoCAD Map 3D
State of Oregon > http://wms.oregonexplorer.info/ecwp/ecw_wms.dll?service=wms&version=1.1.1&REQU EST=GetCapabilities ERMAPPER > http://demo.ermapper.com/ecwp/ecw_wms.dll?
(you need to include the “?” even
though it doesn’t underline… )
Intergraph’s demo server > http://maps1.intergraph.com/wms/world/request.asp LMIC GeoServer > http://geoint.lmic.state.mn.us/cgi‐bin/wms? GlobeXplorer > http://wms.globexplorer.com/gexservlets/wms?SERVICENAME=wms_world Demis > http://www2.demis.nl/mapserver/request.asp USGS EROS > http://gisdata.usgs.net/servlet/com.esri.wms.Esrimap?servicename=USGS_WMS_REF i3 server> http://www.datadoors.net/__streaminguid.08d86a6b-a3f4-4c84-b2dfae834498b8f5/wms.ashx?
Weather Data > http://maps.customweather.com/image Global SRTM and DTED data > http://wms.jpl.nasa.gov/wms.cgi? You will find several more servers listed in the AutoCAD Map 3D Help file
Looking closer In the US this will most likely be 1:24K in order to take advantage of the publicly available USGS DRGs and digital orthophotos (DOQQs). We will also utilize some 5’ contours made available by the county in which our project is located. More detailed analysis of the terrain and project constraints, including identification of potentially sensitive environmental areas, can be investigated at this scale. Additional data layers can be imported through the use of Map 3D’s FDO feature, which supports the direct use of many data formats without conversion. The powerful data integration capability coupled with analysis tools helps us to easily adjust our proposed route for business and environmental benefit. The results can be used to support the environmental regulatory permitting process for the project. We located and downloaded data for this project from many varied locations. A list is included below to offer a sense of the potential resources yo have available for your projects. http://www.gisinventory.net/summaries/ http://www.collinssoftware.com/freegis_by_region.htm http://www.csc.noaa.gov/digitalcoast/ http://seamless.usgs.gov/index.php
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Digital Terrain Modeling with AutoCAD Map 3D
http://nmviewogc.cr.usgs.gov/Run.htm http://lidar.cr.usgs.gov/LIDAR_Viewer/viewer.php http://opentopo.sdsc.edu:8080/gridsphere/gridsphere?cid=datasets http://www.sccgov.org/portal/site/planning/planningchp? http://www.sanjoseca.gov/gis/ These links include Global, National, Regional and local datasets. It is very important that you are aware of the scale, age and accuracy of data you download to be able to properly apply it. The data located at these sited is vector (roads, soils) raster (ortho imagery, DEM, DRG) and LiDAR.
Final stretch Once a preferred preliminary route location has been determined such that more detailed on the ground analysis can be justified, a LiDAR survey of the proposed corridor can be requested. The Surveying Tools kit can then be used to import the LiDAR data and build a highly accurate surface model. If the new National Map .5 meter digital ortho-photos are available for the study area these can also be imported. The geospatial analysis capabilities of Map 3D can then be applied to generate buffers, filter and query the data to determine the area of project impact, affected property owners, and other inputs to the reports required for regulatory submission and approval. Fine tuning adjustments to the proposed location can also be made at this stage. The presentation features of Map 3D can also be invoked to generate the presentation drawings and maps for the public hearing process. This information could be published to Autodesk MapGuide to support an online review process.
AutoCAD Map 3D Workflow The following step by step guide is provided in support of the design and analysis of the proposed project.
Search Public Data Sources
Assemble 1:250K basemap using WMS & identify possible routes
Switch to 1:24K scale to identify preferred route(s)
Obtain detailed LiDAR survey data for permitting
The basic steps we used for this work flow:
Connect to WMS (1:250K scale)
Using contours and imagery sketch in proposed routes 5
Digital Terrain Modeling with AutoCAD Map 3D
Convert routes to SDF using Schema Editor
Build 1:24,000 map (Roads, Streams, Digital quadsheet, contours, etc)
Generate surface from contours
Buffer Streams
Select preferred alignment and adjust as needed
Now for the details
Request LiDAR survey of proposed corridor
Import LiDAR points and build DEM
Use Map to import data layers via FDO
Create buffers to identify impacted customers
Query and create reports to support permitting
Prepare public hearing presentation and publish to Autodesk MapGuide for internal and external web access. While this process is not complete and would surly be more complex that what we have done today. It is our hope that you will discover that the surveying tools available for Map 3D subscription customers is a powerful and easy to use addition to the robust AutoCAD Map 3d sutie of tools.
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Digital Terrain Modeling with AutoCAD Map 3D
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Digital Terrain Modeling with AutoCAD Map 3D
>>>>>>>>>>>>>INSTRUCTIONS BELOW - READ and DELETE
