Mass point ASCII files are not merged but a merged Maintained only at the idxp7500tile level. Separate source-specific versions of the dgm elevation data in TIN and ASCII format are Contours generated at an interval finer than 5-feet may not meet necessary accuracy requirements for specific environmental or building purposes needs and do not take the place of a first-order ground survey. In particular, derivation of contours, whether from the raw ascii points or a derived surface (i.e., lattice or tin), should be approached with caution due to the high variability of the data. For many purposes a site- and use-specific field survey will be necessary. Users must make careful review of the fitness of these data for their particular use.
![terramodel text encoding terramodel text encoding](https://img.yumpu.com/2089788/1/500x640/dosya-uzantilari-ve-ait-olduklari-programlar.jpg)
This is due to a large variance in the number of points from area to area that are considered 'to-ground' values combined with the variance in absolute horizontal and positional accuracy of given points. Finally, due to changing ground and vegetative conditions the quality and accuracy of the data vary considerably with areas of steep relief and/or dense vegetation exhibiting poorer quality than open flat areas. Further, the data are not without error due to incomplete editing, absence of sufficient point density, and other 'blunder' or erroneous points.
#Terramodel text encoding series
These data was processed through an extensive series of quality control steps by both the vendors and clients however, they are still considered an interpretation or model of the earth's surface rather than an absolute point-to-point measure. Useful for a range of analytical and cartographic projects including flood hazard evaluation, geologic mapping, hydrologic modeling, slope and aspect determination, and line-of-sight calculations. Data is stored as variably-spaced point text files (ASCII), ArcInfo TIN (Triangulated Irregular Network) format, ArcInfo Lattice Grids, and hillshade TIFF images.Ĭomparable in purpose and use to the USGS Digital Elevation Model (DEM) data but generally of a higher level of accuracy and sample density.
![terramodel text encoding terramodel text encoding](https://images.slideplayer.com/23/6824089/slides/slide_21.jpg)
Depicts - within limits of operational accuracy, point density and editing efficiencies - a 'bare-earth' interpretation of the earth's surface.Also called Digital Ground Model (DGM), Virtually-Deforested (VDF) Model, or 'Mowed' surface. Last-return LiDAR data edited to remove 90-95% of vegetated and man-made elevated features. Online_Linkage: None Description: Abstract: This product is derived from LiDAR elevation model data obtained from the PSLC (Puget Sound LiDAR Consortium) and from the King County ESA/SAO (Endangered Species Act/Sensitive Areas Ordinance) project. Publication_Information: Publication_Place: King County, WA Publisher: King County Other_Citation_Details:
![terramodel text encoding terramodel text encoding](https://higherlogicdownload.s3.amazonaws.com/TRIMBLE/JiveInlineImages/137943.png)
Raster digital data, Tabular digital data, TIN digital data, TIFF and JP2 Identification_Information: Citation: Citation_Information: Originator: King County Publication_Date: 200307 Title: LiDAR Digital Ground Model (DGM) Elevation and Hillshade Edition: One Geospatial_Data_Presentation_Form:
![terramodel text encoding terramodel text encoding](https://sb.studylib.net/store/data/008451536_1-c93010a0bcdbcdbf2eab231b70d3ce44-768x994.png)
LiDAR Digital Ground Model (DGM) Elevation and Hillshade LiDAR Digital Ground Model (DGM) Elevation and Hillshade