20190919
16451800
1.0
FALSE
CreateMosaicDataset "Database Connections\Connection to gissqlcluster03.sde" COLOR_2019 "PROJCS['NAD_1983_HARN_StatePlane_Virginia_North_FIPS_4501_Feet',GEOGCS['GCS_North_American_1983_HARN',DATUM['D_North_American_1983_HARN',SPHEROID['GRS_1980',6378137.0,298.257222101]],PRIMEM['Greenwich',0.0],UNIT['Degree',0.0174532925199433]],PROJECTION['Lambert_Conformal_Conic'],PARAMETER['False_Easting',11482916.66666666],PARAMETER['False_Northing',6561666.666666666],PARAMETER['Central_Meridian',-78.5],PARAMETER['Standard_Parallel_1',38.03333333333333],PARAMETER['Standard_Parallel_2',39.2],PARAMETER['Latitude_Of_Origin',37.66666666666666],UNIT['Foot_US',0.3048006096012192]];-110512500 -88858000 36916142.964165;-100000 10000;-100000 10000;3.28083333333333E-03;0.001;0.001;IsHighPrecision" # # NONE #
BuildOverviews "Database Connections\Connection to gissqlcluster03.sde\GISIMAGE.GIMAGE.COLOR_2019" # DEFINE_MISSING_TILES GENERATE_OVERVIEWS GENERATE_MISSING_IMAGES REGENERATE_STALE_IMAGES
CalculateStatistics "Database Connections\Connection to gissqlcluster03.sde\GISIMAGE.GIMAGE.COLOR_2019" 1 1 # OVERWRITE "Feature Set"
AnalyzeMosaicDataset "Database Connections\Connection to gissqlcluster03.sde\GISIMAGE.GIMAGE.COLOR_2019" # FOOTPRINT;FUNCTION;RASTER;PATHS
CalculateStatistics "Database Connections\gimage_gissqldblis.sde\GISIMAGE.GIMAGE.COLOR_2019" 1 1 # OVERWRITE "Feature Set"
GISIMAGE.GIMAGE.COLOR_2019
Server=gissqldblis; Service=sde:sqlserver:gissqldblis; Database=GISIMAGE; User=gimage; Version=sde.DEFAULT
ArcSDE Connection
11630000.000000
11820000.000000
6990000.000000
7170000.000000
1
Projected
GCS_North_American_1983_HARN
Linear Unit: Foot_US (0.304801)
NAD_1983_HARN_StatePlane_Virginia_North_FIPS_4501_Feet
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County Office of Mapping and Geographic Information
Base Map Coordinator
703-771-5778
703-771-5075
1 Harrison Street, S.E., 2nd Floor
PO Box 7000
Leesburg
VA
20175
US
mapping@loudoun.gov
Monday - Friday 8:00 - 5:00 EST
20210714
ArcGIS Metadata
1.0
Loudoun County Office of Mapping & Geographic Information (OMAGI)
Public Information Counter
703-771-5778
703-771-5075
PO Box 7000
1 Harrison Street, S.E., 2nd Floor
Leesburg
VA
20175
US
mapping@loudoun.gov
8:00-5:00 EST, M-F
Contact OMAGI Public Information Counter
Select ortho tile images and complete order form: Visit our website at: http://www.loudoun.gov/omagi, click on "OMAGI Documents and Information." Our "Products & Services" link will lead you to order forms and lists of available data. Hardcopy maps may also be available; please contact the Mapping Office Public Information Counter for more information regarding all data requests.
GeoTIFF 6.0
6.0
no compression applied
2019 Digital Orthophoto
COLOR_2019
0621-20-19
Loudoun County, Virginia, Office of Mapping and Geographic Information (OMAGI)
Loudoun County, VA
Leesburg, Virginia
Loudoun County annually obtains leaf-off, aerial imagery in the spring. Since 2004, the County has utilized this imagery to support the development of an annual digital orthophoto base. In 2019, the imagery was captured with a Z/I DMCIIe 230 digital camera, in 4-band (R,G,B, and NIR) format. These files contain 1-foot ground-resolution, 8-bit, 4-band orthorectified aerial image map products in GeoTIFF version 6.0 file format. GeoTIFF files are uncompressed raster images complete with TFW coordinate information. The aerial imagery project encompasses the entire land area of the County of Loudoun, VA. Images were flown during leaf-off conditions and cover 5000' by 5000' and are tiled according to the VBMP 200-scale gridding schema (Virginia Geographic Information Network).
This annual digital ortho effort is implemented and administered by the Loudoun County Office of Mapping and Geographic Information. While primarily developed to capture annual base planimetric, environmental, and topographic updates throughout the County, the backdrop image can also serve as a reference layer for GIS analysis, Computer-aided Dispatching and E-911 services, Staff planning and development, historical record in land use/land cover change, and has the potential for use in many other public service projects.
"March 2019 Photography flown by the Sanborn Map Company, Colorado Springs, CO." "Digital Orthophotography compiled by Sanborn Map Company, Colorado Springs, CO"
Base Map Coordinator
Loudoun County, VA OMAGI
Base Map Coordinator
703.771.5778
703.771.5075
PO Box 7000
1 Harrison St. SE, 3rd Floor
Leesburg
VA
20175
US
mapping@loudoun.gov
8:00-5:00 EST, M-F
Loudoun
Commonwealth of Virginia
County
USA
Environment
Emergency management
Wetlands
Land use or land cover
Economic development
Tourism or recreation
Digital Orthophotography
Miscellaneous
Infrastructure or ground transportation
Planimetric
MEL Product Thesaurus
imageryBaseMapsEarthCover
ISO19115
Environment
imageryBaseMapsEarthCover
Loudoun
Emergency management
Wetlands
Land use or land cover
Economic development
Tourism or recreation
Commonwealth of Virginia
Digital Orthophotography
Miscellaneous
County
USA
Infrastructure or ground transportation
Planimetric
Every reasonable effort has been made to assure the accuracy of these data. Loudoun County, Virginia does not assume any liability arising from the use of these data. These data are provided without warranty of any kind, expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular service. Reliance on these data is at the risk of the user.
none.
Not Available
Not Available
Data was generated for use by Loudoun County and are available to the public. This image data has been developed using procedures designed to produce data to National Standard for Spatial Data Accuracy (NSSDA) and is intended for use at 1:2400 scale or smaller. Acknowledgement of Loudoun County would be appreciated in products derived from this data. Every reasonable effort has been made to assure the accuracy of these data. Loudoun County, Virginia does not assume any liability arising from the use of these data. These data are provided without warranty of any kind, expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular service. Reliance on these data is at the risk of the user.
ground condition
0312-20-19
Data are stored in the corporate ArcSDE Geodatabase as a raster feature class. SDE geotabase imagery is available in the County's GIS, whereas copies of source files are provided for public distribution. The coordinate system is Virginia State Plane (North), Zone 4501, datum NAD83 HARN. Digital Terrain Models were collected for the purposes of orthorectification.
Version 6.2 (Build 9200) ; Esri ArcGIS 10.8.1.14362
1
-77.983601
-77.308375
39.335910
38.836886
Not Available
Not Available
This metadata was created in xml file format and specific elements may not apply if your data is exported to other formats. User must be aware that changes to data schema occur during data export that may not be reflected in this metadata, which represents Loudoun County's corporate geodatabase. Acknowledgement of Loudoun County would be appreciated in the use of this metadata.
The dataset contains raster images of digital orthophotography so the logical consistency report is not applicable. The file naming convention is based on the lower left/southwest corner of the image. Tile names are 17 characters long with a 3 character extension. An example tile name is: 19_DO_N17_7082_20.TIF. The first two characters represent the year of photography, ('19 = 2019). The next two characters represent the product code (DO = digital orthophotograph, TM = terrain model). After an underscore to separate the code, the following three characters are the Prefix to maintain uniqueness in the project. The first character indicates the state plane zone (N = North, S = South), and the next two numbers indicate the coordinate pairing of the million units of the Easting and Northing coordinates for the lower left/southwest corner of the tile. The remaining numbers are duplicated from the same grid system emplyed in the VBMP program at Virginia Geographic Information Network. An underscore separates the Prefix from the BMU (Base Modular Unit) of the next four numbers. The Base Modular Unit designates the name for 1:4800 scale imagery tiles which correspond to a 10,000 foot grid based on even 10,000 increments of the Virginia State Plane. Following another separator is a two number suffix. The first digit of the Suffix number designates the quadrant of the BMU that a nested 5,000 foot tile grid occupies. Quadrants are numbered from 1 to 4 starting with the Lower Left quadrant of the BMU, increasing in a clockwise direction. The second digit of the Suffix number designates the quadrant of the 5,000 foot tile that a nested 2,500-foot tile grid occupies. Quadrants are numbered from 1 to 4 starting with the Lower Left quadrant and increasing in a clockwise direction.
The project consisted of a total of 684 total images in the Virginia North State Plane Zone for 1' = 200' scale imagery.
Where there is no data present, null data will be calculated as 255. All data was delivered "as-is" without removal image artifacts. There will be no overedge on the deliverable orthophoto tiles.
A random sampling method was utilized to locate 21 points over the entire project area to be used in the accuracy assessment. Previously measured or surveyed points were used as a reference points. The resultant accuracy of the measurements yield a circular RMSE of 1.5 US Survey feet in the horizontal domain. Measured at a 95 percent confidence level, any point measured will be within 2.54 US Survey feet in the horizontal domain.
Compiled to meet 2.54 feet horizontal accuracy at 95 % confidence level in accordance with National Standards for Spatial Data Accuracy (NSSDA).
1.5 US Survey feet or Circular RMSE 2.54 feet
Not Available
3. Sanborn performed DAT on the digital stereo images using the ground control points from 2014 Virginia Base Map Program (VBMP) within Loudoun County. 4. Using the DAT solution and updated DTM, orthophotos were generated at 1ft resolution. 5. The orthos were color balanced and then mosaiced using seamlines. 6. The mosaics were checked and corrected for any color differences, bridge distortions, etc. 7. The mosaics are cropped according to the VBMP tile grid with standard VBMP naming convention with the prefix 19 (to identify the year of imagery) 8. The tiles were submitted in TIFF format with ESRI compatible world files as well as compressed MrSID files. MrSID files were compressed at a ratio of 20:1 9. A full mosaic of all the ortho photos is created in MrSID MG3 format with 22:1 compression ratio.
Sanborn Map Company
866.726.2676
719.528.5093
1935 Jamboree Drive, Suite 100
Colorado Springs
CO
80920
US
coloradosprings@sanborn.com
www.sanborn.com
1. Sanborn acquired aerial imagery using the DMCIIe mapping camera on March 10th, 11th, and 12th 2019. The digital aerial imagery for the 1-foot resolution orthophotography was collected at an average flying height of 16,400 feet above sea level. 2. Sanborn processed digital images to tif format using Intergraph image processing software, for use in AT and digital ortho production.
Sanborn Map Company
866.726.2676
719.528.5093
1935 Jamboree Drive, Suite 100
Colorado Springs
CO
80920
US
coloradosprings@sanborn.com
www.sanborn.com
digital imagery produced by the Vexcel UtraCam camera
12000
179117
0620-20-19
Loudoun County, VA OMAGI
ground condition
0312-20-19
2
1
0
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11820000.000000 7170000.000000
11820000.000000 6990000.000000
11725000.000000 7080000.000000
190000
1.000000
180000
1.000000
EPSG
8.9.3(9.0.0)
Band_1
255.000000
0.000000
8
Band_2
255.000000
0.000000
8
Band_3
255.000000
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Band_4
255.000000
0.000000
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