Lake Winnipeg Shoreline LiDAR | |
Data format: Raster Dataset File or table name: e054_lw Coordinate system: Universal Transverse Mercator Theme keywords: topography, LiDAR, bare-earth, high-resolution, LAS, DEM, light detection and ranging, digital terrain model, digital elevation model |
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Abstract:
The Lake Winnipeg Shoreline LiDAR data is a raster layer in TIFF format. The raster is a 1m grid representing elevation along the shoreline from Riverton on the west side of the lake to Travers Bay on the east. |
Metadata elements shown with blue text are defined in the Federal Geographic Data Committee's (FGDC) Content Standard for Digital Geospatial Metadata (CSDGM). Elements shown with green text are defined in the ESRI Profile of the CSDGM. Elements shown with a green asterisk (*) will be automatically updated by ArcCatalog. ArcCatalog adds hints indicating which FGDC elements are mandatory; these are shown with gray text.
The Lake Winnipeg Shoreline LiDAR data is a raster layer in TIFF format. The raster is a 1m grid representing elevation along the shoreline from Riverton on the west side of the lake to Travers Bay on the east.
Data acquired for a high quality DEM of the Lake Winnipeg shoreline.
ground condition
None
200 Saulteaux Crescent
Not applicable
+/- 40 to 60 centimeters on all but extremely hilly terrain.
1,461 Kinematic check points along multiple roadways within the project site were compared with the LIDAR bald earth surface. A comparison of LIDAR data with the kinematic checkpoints yielded the results given in Table 1. Table 1: Kinematic Comparison (meters) Average dz +0.000 Minimum dz -0.132 Maximum dz +0.122 Average magnitude 0.040 Root mean square 0.048 Std deviation 0.048 Terrapoint also utilizes a proprietary software package that performs a fully automated analysis of the quality of the lidar data using overlapping flight lines. Our flight lines overlap 30 to 50% on either side and thus 60 to 100% of points can be checked for overlap consistency. The overlap analysis attempts to minimize the differences in overlap areas by fine-tuning the calibration parameters of the LIDAR system.
Acquisition: Acquision Equipment: LIDAR Sensor: Optech ALTM 3100EA #5142, 100 kHZ System IMU: Applanix (Litton LN200) Onboard GPS: Applanix (Trimble), Ground Reference Stations: Sokkia GSR2600 (3) Aircraft: Aircraft Base: Gimli Airport & Winnipeg St. Andrews Airport Primary GPS Control: All LIDAR Data was referenced to Natural Resources Canada Monuments 82R311 and 75RA42. In addition, all groundtruthing activities were tied to these same monuments. Datasheets for these points are given below: SITE IDENTIFICATION Unique Number : 75RA42 Name : 75RA42 Established By : Man. Dept. Of Natural Resources (Surveys And Mapping Branch) Province : MB Prov. Identifier : None NTS Map No : 062I09 STATION COORDINATES Horizontal Datum : NAD83CSRS Method : Global Positioning System Latitude : N50° 44' 50.7995" +/- 0.004 m Std Dev. (68% confidence level) Longitude : W96° 08' 57.3669" +/- 0.003 m Std Dev. (68% confidence level) Ellipsoidal Height : 218.64 m +/- 0.022 m Std Dev. (68% confidence level) Geoid Separation (HTv2.0) : -30.038 m Agency : Geodetic Survey Division Adjustment Net : M04711 Epoch : 1997 UTM : Zone = 14 N = 5625615.85 m E = 701102.19 m XYZ Coords.: = X = -433185.68 m Y = -4020696.32 m Z = 4915984.62 m VERTICAL DATA Vertical Datum : CGVD28 Elevation : 248.681 m Order : First Order Method : Differential Adjustment Line : VA2M77 Published Year : 1977 STATION MARKER INFORMATION AND LOCATION Marker Type : Permanent Agency Marker Inspected in : 1992 Status: Good Inspection Comments : No inspection text on file Accessible by passenger car or light truck and a walk of 50 to 500 m PINE_FALLS ROCK OUTCROP NORTH OF 6TH BASELINE ALONG HIGHWAY NO. 304, 27.4 KM NORTHEAST OF POST OFFICE, 24.6 KM NORTH OF JUNCTION WITH HIGHWAY NO. 11 (CLARK'S CORNERS), 6.3 KM SOUTHEAST OF BRIDGE OVER O'HANLY RIVER, TABLET IN TOP 80 M EAST OF CENTRE LINE, 45 M NORTH OF BASE LINE. ESTABLISHED BY MANITOBA SURVEYS & MAPPING BRANCH. HISTORICAL COORDINATES NOTE: Coordinates listed below are no longer maintained by GSD and should be verified with your provincial agency before use. Horizontal Datum : NAD83 Method : Multiple Methods Latitude : N50° 44' 50.77787" Longitude : W96° 08' 57.33541" UTM : Zone = 14 N = 5625615.209 m E = 701102.835 m Horizontal Datum : NAD27 Method : Doppler Positioning Latitude : N50° 44' 50.74234" Longitude : W96° 08' 56.31101" UTM : Zone = 14 N = 5625396.295 m E = 701129.635 m PROJECTS IDENTIFIERS: 50096 VA2M77 DOPPLER JUNCTION GPS FRMNAD83 JUNE90 SECDOP Station 2 of 2 SITE IDENTIFICATION Unique Number : 82R311 Name : 82R311 Established By : Man. Dept. Of Natural Resources (Surveys And Mapping Branch) Province : MB Prov. Identifier : None NTS Map No : 062I14 STATION COORDINATES Horizontal Datum : NAD83CSRS Method : Global Positioning System Latitude : N50° 56' 57.3069" +/- 0.002 m Std Dev. (68% confidence level) Longitude : W97° 02' 19.0901" +/- 0.002 m Std Dev. (68% confidence level) Ellipsoidal Height : 192.80 m +/- 0.012 m Std Dev. (68% confidence level) Geoid Separation (HTv2.0) : -30.078 m Agency : Geodetic Survey Division Adjustment Net : M01707 Epoch : 1997 UTM : Zone = 14 N = 5646013.16 m E = 637772.67 m XYZ Coords.: = X = -493406.40 m Y = -3996193.01 m Z = 4930139.51 m VERTICAL DATA Vertical Datum : CGVD28 Elevation : 222.881 m Order : First Order Method : Differential Adjustment Line : CP89208 Published Year : 1989 STATION MARKER INFORMATION AND LOCATION Marker Type : Permanent Agency Marker Inspected in : 1996 Status: Good Inspection Comments : None Accessible by passenger car or light truck and a walk of less than 50 m RIVERTON MANITOBA GOVERNMENT HELIX PIPE BENCH MARK NEAR NORTHEAST CORNER OF SECTION 36-22-03 EPM, 4.9 KM SOUTH AND 1.7 KM WEST OF JUNCTION OF HIGHWAYS NOS 8 AND 329, 0.2 KM EAST OF GRAVEL ROAD ALLOWANCE ALONG EAST BOUNDARY OF SECTION 36-22-03 EPM, ABOUT 50 M SOUTH OF LEGAL SURVEY MONUMENT AT NORTHEAST CORNER OF SECTION 36, ON SOUTH SIDE OF ROAD ALLOWANCE, 20.5 M SOUTH OF FENCELINE ALONG NORTH SECTION BOUNDARY, 4.3 M EAST OF MARKER POST AND A NORTH-SOUTH FENCE LINE 50 CM BELOW GROUND LEVEL. HISTORICAL COORDINATES NOTE: Coordinates listed below are no longer maintained by GSD and should be verified with your provincial agency before use. Horizontal Datum : NAD83 Method : Multiple Methods Latitude : N50° 56' 57.29346" Longitude : W97° 02' 19.06188" UTM : Zone = 14 N = 5646012.756 m E = 637773.231 m Horizontal Datum : NAD27 Method : Inertial Survey System Latitude : N50° 56' 57.28319" Longitude : W97° 02' 17.86104" UTM : Zone = 14 N = 5645794.479 m E = 637801.267 m PROJECTS IDENTIFIERS: 50097 CP89208 JUNCTION FRMNAD83 GPS JUNE90 VA_ADJ
http://www.Terrapoint.com
Processing. GPS, IMU, and rangefinder data were processed to obtain XYZ coordinates of surveyed points using Applanix & Optech processing software. Airborne GPS kinematic data was processed on-site using GrafNav kinematic On-The-Fly (OTF) software. Flights were flown with a minimum of 6 satellites in view (13o above the horizon) and with a PDOP of better than 4.5. Distances from base station to aircraft were kept to a maximum of 35 km, to ensure a strong OTF (On-The-Fly) solution. For all flights, the GPS data can be classified as excellent, with GPS residuals of 5cm average but no larger than 9 cm being recorded. Calculation of 3D laser points (raw data) The post-processing software to derive X, Y, Z values from roll, pitch, yaw, and range is Optech's Realm.
http://www.Terrapoint.com
Post-processing Carried Out April, 2007 The data was processed using the software TerraScan, and following the methodology described herein. The initial step is the setup of the TerraScan project, which is done by importing client provided tile boundary index encompassing the entire project areas. The 3D laser point clouds, in binary format, were imported into the TerraScan project and divided into tiles. Once tiled, the laser points were classified using a proprietary routine in TerraScan. This routine removes any obvious outliers from the dataset following which the ground layer is extracted from the point cloud. The ground extraction process encompassed in this routine takes place by building an iterative surface model. This surface model is generated using three main parameters: building size, iteration angle and iteration distance. The initial model is based on low points being selected by a "roaming window" with the assumption is that these are the ground points. The size of this roaming window is determined by the building size parameter. The low points are triangulated and the remaining points are evaluated and subsequently added to the model if they meet the iteration angle and distance constraints. This process is repeated until no additional points are added within an iteration. A second critical parameter is the maximum terrain angle constraint, which determines the maximum terrain angle allowed within the classification model. The data is then manually quality controlled with the use of hillshading, cross-sections and profiles. Any points found to be of class vegetation, building or error during the quality control process, are removed from the ground model and placed on the appropriate layer. An integrity check is also performed simultaneously to verify that ground features such as rock cuts, elevated roads and crests are present. Once data has been cleaned and complete, it is then reviewed by a supervisor via manual inspection and through the use of a hillshade mosaic of the entire project area.
http://www.Terrapoint.com
Surface generation All return data exported, not gridded, with intensity values in comma delimited ASCII and LASv1.0 format. Bare Earth data exported, not gridded, in comma delimited ASCII and LASv1.0 format. Surface generation Bare Earth Point Data (DTM) Ground returns were used to construct a triangulated irregular network (TIN) which was then sampled at 1m intervals to produce the ESRI ASC grid.
http://www.Terrapoint.com
1m grid in ascii (x, y, z) format received from Terrapoint Inc. are unzipped and the file extension renamed to .txt. An AML called ld_fmttxtshore.aml was run against the text files to format the files properly. Another AML called ld_lidar_grid.aml is used to create the 1m grid files. The grid files are merged together using MERGE.
200 Saulteaux Crescent
There are no other attributes other than the elevation values and the encoded values for easting and northing coordinates. There are no attached attribute tables.
2400, 639 5th Avenue SW