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These contours have been created from 4.5 meter resolution digital terain model data. The terrain model data was obtained by Interferometic Synthetic Aperture Radar (IFSAR) by the U.S. Army in 2009.The 4.5 meter resolution data terrain model data can only be used by Federal and State agencies.The countour interval is stated in the name of the feature class. THIS DATA IS CONVERTED TO FEET in order to conform with U.S. topographic maps, thus it will not align with the Coordinate Reference System of the Feature dataset.4.5 m Digital Terrain Models specs:Data_Quality_Information:Attribute_Accuracy:Attribute_Accuracy_Report: Calculation of the digital elevation model is described in the Intermap Technologies Core Product Handbook User's Guide. <URL: http://www.intermap.com/images/handbook/producthandbook.pdf>Completeness_Report: Coverage maps are provided for each acquisition.<URL: http://www.intermap.com/images/handbook/producthandbook.pdf>Positional_Accuracy:Horizontal_Positional_Accuracy:Horizontal_Positional_Accuracy_Report: All data products are 2 meters RMSE or better in areas of unobstructed flat ground.Vertical_Positional_Accuracy:Vertical_Positional_Accuracy_Report: 1 meter RMSE or better in areas of unobstructed flat ground. |