Big Ten Academic Alliance Geospatial Discovery Portal

Big Ten Academic Alliance Geoportal

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1.
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Abandoned Rail Lines: Iowa

2017. Iowa Department of Transportation. This layer depicts abandoned rail lines in Iowa.

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Access Control to the Primary Highway System: Iowa

2016. Iowa Department of Transportation. The Iowa DOT has established an access management policy to control access to the Primary Highway System. This layer depicts all non-Priority 1 cla...

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Active Digital Message Signs: Iowa

Iowa Department of Transportation's Intelligent Transportation System (ITS) Digital Message Signs (DMS) devices.

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Active Rail Lines: Iowa

2017. Iowa Department of Transportation. This layer depicts the current active rail lines for the State of Iowa.

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Adopt-A-Highway Status: Adopted: Iowa

2016. Iowa Department of Transportation. This layer displays all of the currently adopted Iowa Highway segments as related to the Adopt-A-Highway program. These layers were developed for u...

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Adopt-A-Highway Status: Never Adoptable: Iowa

2016. Iowa Department of Transportation. This layer represents the sections of highway which are never available for adoption within the Adopt-A-Highway program. This symbolization was dev...

7.
Aerial Photo Counties: Iowa, 2016

Aerial Photo Counties: Iowa, 2016

2016. These county-wide datasets have been up-sampled to a one-meter-resolution raster, in jp2 format.

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Aerial Photography Counties: Iowa, 1930s

Aerial Photography Counties: Iowa, 1930s

1930. Iowa Department of Natural Resources. 1930s Aerial Photography of Iowa County dataset in a zipped file.

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Aerial Photography Counties: Iowa, 1950s

Aerial Photography Counties: Iowa, 1950s

1950. Iowa Department of Natural Resources. 1950s Aerial Photography of Iowa County dataset in a zipped file.

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Aerial Photography Counties: Iowa, 1960s

Aerial Photography Counties: Iowa, 1960s

1960. Iowa Department of Natural Resources. 1960s Aerial Photography of Iowa County Dataset in a zipped file.

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Aerial Photography Counties: Iowa, 1970s

Aerial Photography Counties: Iowa, 1970s

1970. Iowa Department of Natural Resources. 1970s Aerial Photography of Iowa Each zip file contains a county raster dataset.

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Aerial Photography Dates File: Iowa, 1930s

Aerial Photography Dates File: Iowa, 1930s

1930. Iowa Department of Natural Resources. This file contains a shapefile of the centroids of individual scanned photos, and the associated date.

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Aerial Photography Dates: Iowa, 1950s

1950. Iowa Department of Natural Resources. Zipped file Contains a dateset of the centroids, with dates, of the individual images used.

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Aerial Photography Dates: Iowa, 1960s

1960. Iowa Department of Natural Resources. This dataset is centroids with dates of the individual images used.

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Aerial Photography Dates: Iowa, 1970s

1970. Iowa Department of Natural Resources. This shapefile has centroids with dates of all images used in this dataset.

16.
Agricultural Drainage Wells: Iowa

Agricultural Drainage Wells: Iowa

2017. Iowa Department of Natural Resources. Agricultural Drainage Wells in Iowa Wells and intakes.

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Airport Part 77 Surfaces - Approach: Iowa

2016. Iowa Department of Transportation. The approach surface is longitudinally centered on the extended runway centerline and extends outward and upward from each end of the primary surfa...

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Airport Part 77 Surfaces - Approach (Precision): Iowa

2016. Iowa Department of Transportation. The approach surface is longitudinally centered on the extended runway centerline and extends outward and upward from each end of the primary surfa...

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Airport Part 77 Surfaces - Conical: Iowa

2016. Iowa Department of Transportation. The Conical surface extends outwards and upwards from the boundary of the horizontal surface at a slope of 20:1 for a horizontal distance of 4,000 .

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Airport Part 77 Surfaces - Horizontal: Iowa

2016. Iowa Department of Transportation. The Horizontal surface is a plane 150 above the established airport elevation. The perimeter of which is constructed by swinging arcs of specified ...