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Service Description: This dataset contains georeferenced aerial imagery from 1927 and 1930 covering the District of Columbia. The original photographs were created as part of early aerial survey efforts and are held within a combined National Archives and Records Administration (NARA) catalog entry (NARA ID 139056920), Record Group 328. The images were scanned by the National Capital Park and Planning Commission, Federal Projects Planning Division (ca. 1926–ca. 1952). A multi-agency collaboration—including the Historic Preservation Office, OCTO, DHS, OP, DOEE, DOH, and FEMS—completed the georeferencing and mosaic development. As part of this effort, the team georeferenced and cataloged the full 1927 aerial photo series of the District, derived from more than 700 high‑resolution image scans. The resulting mosaic and index provide a historic baseline for land use, urban development, environmental analysis, and cultural resource research.

Name: Ortho/Ortho_1927

Description: This dataset contains georeferenced aerial imagery from 1927 and 1930 covering the District of Columbia. The original photographs were created as part of early aerial survey efforts and are held within a combined National Archives and Records Administration (NARA) catalog entry (NARA ID 139056920), Record Group 328. The images were scanned by the National Capital Park and Planning Commission, Federal Projects Planning Division (ca. 1926–ca. 1952). A multi-agency collaboration—including the Historic Preservation Office, OCTO, DHS, OP, DOEE, DOH, and FEMS—completed the georeferencing and mosaic development. As part of this effort, the team georeferenced and cataloged the full 1927 aerial photo series of the District, derived from more than 700 high‑resolution image scans. The resulting mosaic and index provide a historic baseline for land use, urban development, environmental analysis, and cultural resource research.

Single Fused Map Cache: true

Tile Info:

• Height: 512
• Width: 512
• DPI: 120
• Levels of Detail: 12
  • Level ID: 0 [ Start Tile, End Tile ]
  • Resolution: 63.50012700025401
  • Scale: 300000
  • Level ID: 1 [ Start Tile, End Tile ]
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  • Scale: 200000
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  • Resolution: 0.10583354500042334
  • Scale: 500
  • Level ID: 11 [ Start Tile, End Tile ]
  • Resolution: 0.05291677250021167
  • Scale: 250
• Format: MIXED
• Compression Quality: 75.0
• LERC Error: NaN
• Origin: X: 379605.402
  Y: 148256.304
  
• Spatial Reference: 26985  (26985)  LatestVCSWkid(0)
  

Storage Info:

• Storage Format: esriMapCacheStorageModeCompactV2
• Packet Size: 128

Extent:

XMin: 387895.5619240552
YMin: 123724.94118057814
XMax: 408578.7780067669
YMax: 153098.56664450723
Spatial Reference: 26985  (26985)  LatestVCSWkid(0)

Initial Extent:

XMin: 387895.5619240552
YMin: 123724.94118057814
XMax: 408578.7780067669
YMax: 153098.56664450723
Spatial Reference: 26985  (26985)  LatestVCSWkid(0)

Full Extent:

XMin: 387895.5619240552
YMin: 123724.94118057814
XMax: 408578.7780067669
YMax: 153098.56664450723
Spatial Reference: 26985  (26985)  LatestVCSWkid(0)

Pixel Size X: 0.81655018092032

Pixel Size Y: 0.8378340929270397

Band Count: 3

Pixel Type: U8

RasterFunction Infos: {"rasterFunctionInfos": [{ "name": "None", "description": "", "help": "" }]}

Mensuration Capabilities: Basic

Inspection Capabilities:

Has Histograms: true

Has Colormap: false

Has Multi Dimensions : false

Rendering Rule:

Min Scale: 300000

Max Scale: 1000

Min LOD: 0

Max LOD: 9

Resampling: false

Copyright Text: Office of the Chief Technology Officer, Historic Preservation, DHS, OP, DOEE, DOH, and FEMS

Service Data Type: esriImageServiceDataTypeRGB

Min Values: 0, 0, 0

Max Values: 255, 255, 255

Mean Values: 107.53171546012044, 119.37926583134754, 102.54480829052201

Standard Deviation Values: 43.141294390631245, 37.128231774932544, 38.738244616984716

Object ID Field:

Fields: None

Default Mosaic Method: Center

Allowed Mosaic Methods:

SortField:

SortValue: null

Mosaic Operator: First

Default Compression Quality: 75

Default Resampling Method: Bilinear

Max Record Count: null

Max Image Height: 4100

Max Image Width: 15000

Max Download Image Count: null

Max Mosaic Image Count: null

Allow Raster Function: true

Allow Copy: true

Allow Analysis: true

Allow Compute TiePoints: false

Supports Statistics: false

Supports Advanced Queries: false

Use StandardizedQueries: true

Raster Type Infos:

Name: Raster Dataset
Description: Supports all ArcGIS Raster Datasets
Help:

Has Raster Attribute Table: false

Edit Fields Info: null

Ownership Based AccessControl For Rasters: null

Child Resources:   Info   Histograms   Statistics   Key Properties   Legend   Raster Function Infos

Supported Operations:   Export Image   Identify   Compute Histograms   Compute Statistics Histograms   Get Samples   Compute Class Statistics   Query Boundary   Compute Pixel Location   Compute Angles   Validate   Project