There are 154 CLT Maps that together encompass all of Grainger County.
Five (5) different Themes are available for each of the CLT Maps:
- Planimetric
- Topographic
- Cadastral (Property)
- Aerial Photo
- DTM
Therefore, a total of total map/theme 770 Files (154 x 5) would be needed to provide county-wide coverage for all five themes.
The Grainger County data is captured at a resolution of either 1:1200 (urban areas) or 1:4800 (rural areas). For areas mapped at 1:1200 the CLT map sheet area is 3,500' x 2,000'. For areas mapped at 1:4800 the CLT map sheet area is 14,000' x 8,000'.
Cadastral (Property) and Street Name Annotation Data
Property boundaries, dimensions and lot numbers along with subdivision and street name annotation. The property attributes consist of only the parcel id and GIS-calculated acreage of the parcel. [ Note: the dimensions and lot numbers are not in the form of an Annotation class, but are delivered as "line" feature classes. ]
Date of Data: Updated periodically to reflect recorded property transactions. Last Data Revision Date: 3/1/2004.
Planimetric Data
The planimetric data set contains street centerlines, street name annotation, water bodies and streams. For 1:4800 maps edge of pavement features are availabe. Note: Street Centerlines do not have attribute information.
Date of Data: 3/2005
Topographic Data
The topographic data set has a 5ft contour interval for 1:1200 map sheet areas and a 20ft interval for 1:4800 map sheets. The topographic data was created from the Tennessee Base Mapping DTM data.
Date of Data: 3/2005
Digital Terrain Model (DTM)
The DTMs are in Microstation version SE (DGN) file format, which uses a series of attributes that define values for levels, line styles, colors, and weights to identify features. Generation of the DTMs is captured at 1:30,000 scale photography and 1:7,500 nominal scale photography. Mass points describe all tops, bottoms, and areas where break lines are not more than one inch apart at map scale.
Date of Data: 3/2005
Digital Orthophotography
Orthophotography is 2 ft by 2 ft ground pixel resolution for 1:1200 scale areas, OR .5 ft by .5 ft ground pixel resolution for 1:4800 scale areas. The orthophotography is in TIFF 8 bit grayscale format.
Date of Data: 3/2005
GIS DATA FORMAT: Except where specifically noted, the data is in ESRI geodatabase or Shapefile format, but can be converted to AutoCAD DWG or DXF or MicroStation ($10 per map conversion fee).