OKMaps Statewide Seamless LIDAR Roger Bedell Coordinate Solutions - - PowerPoint PPT Presentation

okmaps statewide seamless lidar
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OKMaps Statewide Seamless LIDAR Roger Bedell Coordinate Solutions - - PowerPoint PPT Presentation

OKMaps Statewide Seamless LIDAR Roger Bedell Coordinate Solutions Inc. Goal Provide access to a statewide LIDAR dataset Seamless across the entire state Visualization Downloads of arbitrary areas of interest Source Data


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SLIDE 1

OKMaps Statewide Seamless LIDAR

Roger Bedell Coordinate Solutions Inc.

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SLIDE 2

Goal

  • Provide access to a statewide LIDAR dataset

– Seamless across the entire state – Visualization – Downloads of arbitrary areas of interest

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SLIDE 3

Source Data

  • Starting in 2009, the NRCS has delivered

thousands of LIDAR files that cover a large part of Oklahoma

– Processed LAS files – 2 meter DEM files, Bare earth and First Return – Each USGS quad split into 64 pieces – Each piece (LAS file) ~200MB – Designed for 2' contour accuracy

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SLIDE 4

pgPointCloud Repository

  • A new (2013) approach by the creator of

PostGIS, Paul Ramsey

  • Stores “patches” of points in a PostGIS

database

  • Very fast access to contiguous patches using

geographic indexing

  • Ideal for the goal of downloading arbitrary

areas

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SLIDE 5

PgPointCloud continued

  • We used patches of 400 points each to fit

within the confines of PostgreSQL. Each row contains one patch.

  • Database currently contains over 170 million

rows, or 68 billion points.

  • Data access is still very fast to pull the records

for a download due to the spatial index.

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SLIDE 6

Visualization

  • The LIDAR based NRCS DEM data was used

to produce hillshaded images.

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SLIDE 7

Bare Earth and First Return

  • First return data shows vegetation.
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SLIDE 8

Enhances Aerial Photos

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SLIDE 9

Colormap and elevation

  • Clicking on the DEM Bare Earth or DEM First

Return will give the elevation (in meters)

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SLIDE 10

All layers downloadable

  • All layers, including DEM, Hillshading, and raw

LAS are downloadable with a custom AOI rectangle or uploaded SHP in multiple formats and projections.

– LIDAR – LAS and LAZ (Compressed LAS) – Visualization – GeoTIFF, BIL, ERS, IMG, JPG,

PNG, NITF

– Projections: OK State Plane, UTM, NAD83,

NAD27, Feet/Meters

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SLIDE 11

Uploading and Displaying User CSV and SHP files

  • CSV files with Latitude and Longitude fields

can be displayed on the map.

  • SHP files can be uploaded and displayed.
  • Polygons in the SHP file can then be used to

define an AOI for downloads.

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SLIDE 12

OKMaps uses Open Source

  • PostGIS for feature and LIDAR storage
  • GeoServer serves images, vector, WMS,

WFS, WCS

  • OpenLayers for display in browsers
  • GeoNetwork for metadata catalog, CSW
  • GDAL and PDAL for importing data
  • Coordinate Solutions “Glue” software to pull it

together