Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships Current status of Elevation Data -State owned Elevation data available

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships Availability – LiDAR/DEMs As of 28 April 2013 Ortho Program Index Pink Counties have Mosaic and Tiles Orange Counties -Tiles only White Counties no data yet Problems with 2012 counties – 12 counties need re-flown Foliage blossomed too soon Ground conditions Snow Wet from rain/flooding Data anomalies Large quantity of data to upload Only two people working this issue Data collection completed. DATA QC ongoing Should have data uploaded and delivered (if not already) Fight schedule for 2013 collection has been completed Woolpert is QC’ing collection for gaps and anomalies.

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships Statewide Imagery Project - Ortho & LiDAR

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships Vertical Accuracy Testing Use Existing Data We need Confidence in the data - Using what we have, we can with a little effort -  Using Projects from 2007 – 2010  Mostly from Work Done for FEMA MapMod Projects  In Various Locations Around the State  In One Location, More or Less in a County We turn to the standards -

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships Reference Documents on IGIC Website Documents are posted on IGIC website: and Vertical Accuracy Assessment Template2.xlshttp://  Template spread sheet for testing LiDAR elevations to survey points  Math set up  Standards for testing LiDAR elevations to survey points for confidence level _10May2004.pdfhttp:// _10May2004.pdf  Guidelines/recommendations for acquiring digital elevation data  Many of the various forms of Elevation data covered.  Guidelines/recommendations for acquiring LiDAR Base data

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships Vertical Accuracy Assessment Template2.xls SAMPLE

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships Accuracy and Limitations of using LiDAR, DEM and Derivative Products FGDC Metadata [and Published Accuracy] for Indiana’s LiDAR & DEM data products IN_2011_Statewide_East_LAS.txt IN_2011_Statewide_West_LAS.txt IN_2011_Statewide_East_IMG_DEM.txt IN_2011_Statewide_West_IMG_DEM.txt IN_2011_Statewide_East_Breakline.txt IN_2011_Statewide_West_Breakline.txt Published Accuracy: The LiDAR data vertical accuracy RMSE is Block cm (0.187 ft), Block cm (0.241 ft) and Block cm (0.215 ft). The data collected under this Task Order meets the National Standard for Spatial Database Accuracy (NSSDA) accuracy standards. IGIC - Indiana GIS LiDAR Applications for Surveyors

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships NSSDA Test National Standard for Spatial Data Accuracy Issued by FGDC in 1998

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships NSSDA Objective The National Standard for Spatial Data Accuracy (NSSDA) implements a statistical and testing methodology for estimating the positional accuracy of points on maps and in digital geospatial data, with respect to georeferenced ground positions of higher accuracy.

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships Testing Methodology – NSSDA requirements Data Producer will determine Geographic extent of testing area. 20 points required for area. Point placement  Better to spread through entire area  Evenly dispersed in four quadrants  10% across entire length of box  *Will require points in different land-use areas Concentration can be heavier in specific areas User can concentrate more points in specified area when warranted by job requirements.

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships Set-up and requirements Ground Truth  Current survey level line points  Ground points ◘ Exclude elevated points ◘ Exclude subsurface points  Make sure nothing has changed since survey ◘ Repaving on roads ◘ Grading/excavation of area  DEM  Software –  ArcMap 10.0 or higher  3d Analyst extension

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships DNR - Vertical Accuracy Testing Using Existing Data Projects from 2007 – 2010 Mostly from Work Done for FEMA MapMod Projects In Various Locations Around the State In One Location, More or Less in a County

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships Vertical Accuracy Testing Haw Creek 2010 Data 2003 Data not used in NSSDA Test Road surface had been repaved.

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships Haw Creek 2010 Data Project from 2010 May have been some changes between survey and LiDAR - Road resurfaced, erosion, Cut/fill areas Data checked to be current 3422 Total Points Too many points. NSSDA only requires 20 Some points on guardrails, bridge low structure etc. not suitable for checking LiDAR data.

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships Testing Methodology Data Producer will determine Geographic extent of testing area. 20 points required for area. Point placement  Better to spread through entire area  Evenly dispersed in four quadrants  10% across entire length of box  *Will require points in different land-use areas Concentration can be heavier in specific areas User can concentrate more points in specified area when warranted by job requirements. Survey elevation data must be higher quality than testing LiDAR to.  Level Lines at 3 rd order  GPS collection – Static GPS

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships Points Needed for Modeling Bridge HEC-RAS 99 Total Points

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships Typical Bridge Section Points on Road surface Channel points are underwater Cannot be used as LiDAR has no data!

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships Weeded Down to 3 Points Down to three points to reflect this area These points represent the area of the survey and are spread across our general area. Points represent ground elevations. For county wide we will points spread across the county, in different land-use areas, and evenly spaced. Left number is elevation from surveys Right number is elevations from DEMs Very close. Possible issues between data sets – Road resurface Cut/Fill areas Erosion New construction

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships Results of Weeding Down Points 3428 Points were Weeded down to about 210 Points. Several more points weeded by looking at their attributes to confirm that they were not ground points. 203 Points Remain.

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships Hydro Flattening. HYDRO FLATTENING:  Concerns when using data around water features. Potential loss of some data.  Only the DEM’s derived from the LAS files. Breaklines digitized from the LAS files.  Point clouds are not as sharp as the orthophotos. A little bit of land may accidently get flattened while a little bit of water may not. Should now be just ± 10 feet.

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships Add LiDAR Value to Point File with ArcMap Changed to “LiDAR_Spot” in attribute table

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships Attribute Table Z value from DEM

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships Check Statistics in ArcMap Most errors fell between -0.4 and 0.6

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships NSSDA Test in Excel NSSDA at 95% Confidence Level is RMSE times 1.96 E – D = F 2 F Square Root of MSE Average of G From Statistics Example – subset of actual

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships NSSDA Test Results – 2011 DEMs Bartholomew – 0.58 ft. Brown – 0.67 ft. Boone – 0.32 ft. Cass – 0.47 ft. Clinton – 0.33 ft. Elkhart – 0.81 ft. Howard – 0.30 ft. Johnson – 0.47 ft. Monroe – 0.72 ft. Morgan – 0.23 ft. These test results – 2011 DEMs - Specific for stream crossings - Not for entire county - Very small portions of county We need to establish confidence levels for data county wide! I NEED MORE POINTS THROUGHOUT THE COUNTIES!!!!!!!

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships Accuracy Reporting Will be included in index Metadata –  Index will be shapefile designed to visually depict area checked.  Shapefile attributed with pertinent data  Vertical datum  Date of check  Check performed by Example in metadata -  0.58 ft. at a 95% confidence level, derived according to NSSDA, i.e., based on RMSE of 0.30 ft. in the open terrain land cover category (Note USGS V1.2 Specification).  If less than 1.2ft, you can create 2 foot contours with confidence. Looking into a certification letter for all this data!  Still muddling through the process for letter

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships Index for Accuracy Reporting IGIC would like to create a tracking system for public use that visually shows where LiDAR data has been checked against survey data. Using qualified survey data, either previously collected or specifically collected for running elevation checks:  Be willing to run checks through the process  Be able to describe the reasoning behind how the process was done with used points.  Be willing to share data sheets and description of area checked to IGIC (free of charge).

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships LiDAR Data Index for State GIO Library

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships FOR THE REST OF THE STORY Conducting a Vertical Accuracy Assessment of Statewide LiDAR Data to support local projects – Wednesday,  That’s 1pm for civilians Mississinewa Room In-depth discussion of this subject

Coordination of Indiana GIS through dissemination of data and data products, education and outreach, adoption of standards, and building partnerships Questions?