Name: DVRPC 1959 aerial - index

Display Field: FLT_LINE

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: This index represents the coverage of the scans of DVRPC's non-orthorectified, mylar, aerial photo enlargements for the year 1959.This layer includes a "STATUS..." attribute field that indicates what scans are missing.Prior to the year 2000, DVRPC’s aerial imagery consisted of mylar aerial photo enlargements or “atlas sheets”. These atlas sheets were produced from 9x9" diapositives. Over 9,500 sheets constitute the coverage of our older or “historical”aerial imagery from the years 1959 and 1965 through 1995 in five year increments. In order to increase the efficiency of using the historical aerial imagery, the sheets were scanned into TIFF (Tagged Image File Format) files. Each TIFF file ranges between 35-40MB in size.Unlike DVRPC’s more recent aerial imagery (2000 and later), the historical aerials are not “orthorectified” or “orthocorrected”. In other words, they are simply aerial images with no spatial reference or uniform scale. Through the process of georeferencing, the scanned images can be assigned a spatial reference which will enable them to be used more readily in a GIS environment. That said, georeferencing is not orthorectifying or orthocorrecting. What it does allow is for the scan to be displayed relative to other spatially referenced GIS layers. A georeferenced scan does not have the properties of an actual orthoimage. Whereas an orthoimage can be used for making accurate measurements, a georeferenced image cannot, as it does not have the spatial accuracy and uniform scale of an orthoimage.

Copyright Text:

Default Visibility: false

MaxRecordCount: 1000

Supported Query Formats: JSON, geoJSON, PBF

Min Scale: 0

Max Scale: 0

Supports Advanced Queries: true

Supports Statistics: true

Has Labels: false

Can Modify Layer: false

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Use Standardized Queries: true

Supports Datum Transformation: true

Extent:

XMin: 441386.4614000004
YMin: 4384530.5217
XMax: 546588.2389000003
YMax: 4475995.177300001
Spatial Reference: 26918  (26918)

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Labeling Info:

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Supports Returning Geometry Centroid: false

HasZ: false

HasM: false

Has Attachments: false

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Type ID Field: null

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• Shape ( type: esriFieldTypeGeometry, alias: Shape )
• FLT_LINE ( type: esriFieldTypeString, alias: FLT_LINE, length: 8 )
• SHEET ( type: esriFieldTypeString, alias: SHEET, length: 8 )
• SHEET_ID ( type: esriFieldTypeString, alias: SHEET_ID, length: 15 )
• STATUS ( type: esriFieldTypeString, alias: STATUS, length: 20 )
• URL ( type: esriFieldTypeString, alias: URL, length: 254 )
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• Shape_Length ( type: esriFieldTypeDouble, alias: Shape_Length )
• Shape_Area ( type: esriFieldTypeDouble, alias: Shape_Area )

Supported Operations:   Query   Query Attachments   Generate Renderer   Return Updates

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