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MnTOPO – A place to view, print, and download LiDAR Elevation Data
Accessing and Viewing Minnesota LiDAR Data On-
line
Tim LoeschMN.IT Services @
Minnesota Department of Natural Resources
Mn GIS/LIS Conference
October 10, 2013
Background
Introducing the MnTOPO Elevation Data Portal
Portal Capabilities – what it is, and what it is not….
Downloading DataOptions and formats…..
Questions and Answers….
MnTOPO Elevation Portal
Minnesota Elevation Mapping ProjectHigh accuracy
elevation data Statewide AvailabilityOpen Data – Available
to everyoneCommon format and
structureFully documented
MnTOPO Elevation Portal
Funded by a variety of sourcesMinnesota Clean Water LegacyState of MinnesotaFederal Government (USGS, NRCS, COE)Minnesota Counties and CitiesState of North Dakota
MnTOPO Elevation Portal
MnTOPO Elevation Portal
15 different collects2005 – 2012
Point spacing0.25 – 8
pts/meter
MnTOPO Elevation Portal
The last few years…Project ManagementContracts – 6Amendments - 5Inter-agency agreements
(2)Grants (2)Joint Powers Agreements
(4)
MnTOPO Elevation PortalME
The last few years - Distribution and Access
FTP access is availableGood for large
downloadsNot ideal for all users
MnTOPO Elevation PortalYOU
I just want the damn data!
MnTOPO - On-line access to Elevation data
MnTOPO Elevation Portal
http://arcgis.dnr.state.mn.us/gis/mntopo
MnTOPO - On-line access to Elevation dataCollaborative effort between DNR, MN.IT @
DNR and MnGEO
@ DNRApplication coding and hostingMap and data services for viewing
MnGEO Data processing and storageBundling and fullfillment of data packages
MnTOPO Elevation Portal
MnTOPO - On-line access to Elevation dataBrowser Based Application
MnTOPO Elevation Portal
MnTOPO - On-line access to Elevation dataGPS enabled
MnTOPO Elevation Portal
MnTOPO - On-line access to Elevation dataMobile Device ready
MnTOPO Elevation Portal
MnTOPO – On-line access to Elevation data
MnTOPO Elevation Portal
Map DisplayBackgrounds
Basemap (ESRI/BING)
Air photos (ESRI/BING)
Terrain – Colored DEM over the top of hillshade
HillshadeOverlays
2, 10, 50 ft ContoursLiDAR Flight LinesFEMA Flood Data
MnTOPO - On-line access to Elevation dataMap Display
Elevation data tile-cached for speedWeb Mercator projection1:2,257 – 1:4,622,324 scales
These factors affect printing……..
MnTOPO Elevation Portal
MnTOPO - On-line access to Elevation dataSearching
Uses BING Search EngineAddresses, place names, coordinates
MnTOPO Elevation Portal
MnTOPO – On-line access to Elevation data
MnTOPO Elevation Portal
Transparency Sliders
MnTOPO - On-line access to Elevation dataRetrieve Elevation Information
MnTOPO Elevation Portal
MnTOPO - On-line access to Elevation dataCreate PDF Maps
MnTOPO Elevation Portal
MnTOPO - On-line access to Elevation dataDownload Data
Draw a polygonSelect productsSelect Product Type
Open Shapefile (vector) Binary (raster) LAS/LAZ
ESRI Geodatabase
LAS files
MnTOPO Elevation Portal
MnTOPO - On-line access to Elevation dataDownload Data – other things to know…
UTM Zone 15, NAD83Raster and Vector data are merged/mosaicedLAS data is stored as compressed LAZ files
LAS data is NOT mergedMetadata is included10gb download limit
MnTOPO Elevation Portal
MnTOPO - On-line access to Elevation dataWhat it is not….
MnTOPO is not a GIS SystemCan’t do precise zooms due to Tile-Cache
limitationsIs not meant to provide high accuracy profiles
required by some applicationsCannot zoom in past 1:2,257Overlays and backgrounds are limitedInternet printing is what it is……
MnTOPO Elevation Portal
MnTOPO - On-line access to Elevation data
Future PlansAdd additional derived elevation products to
displayAdditional Overlays (watersheds, parcels, etc)Improve printing predictabilityProfiles –
Upload shapefiles for profilesProfiles are graphics with editable vertices
Augment search criteria – PLS
MnTOPO Elevation Portal
Credits……Sean Vaughn – Subject Matter ExpertPete Olson – app developerNancy Rader – documentation, guidance and
supportBrent Lund – development and project
managementJim Dickerson – data processingJeremy Moore – interface developmentMike Tronrud – Tile-cache developmentZeb Thomas – data maintenance Fred Logman – project management
MnTOPO Elevation Portal
http://arcgis.dnr.state.mn.us/gis/mntopo
MnTOPO Elevation Portal
