2010 Lower Columbia River Estuary (LCRE) Land Cover Classification Summary. Data Ownership and Reference Citations This dataset is owned and maintained by the Lower Columbia River Estuary Partnership. Users should included an appropriate citation when reproducing this data in the form of a printed product. Classification Process and Data Sources: The 2010 LCRE classified land cover data set was derived using a high resolution image segmentation and object based classification process. The primary data sources include the following: a) 2009 4 band, 1 meter resolution airborne imagery acquired by the USDA National Agriculture Inventory Program (NAIP); b) archived 30m LandSAT TM5 imagery from various dates ranging from 2007-2009; c) 2009-2010 LiDAR elevation data aquired by the US Army Corps of Engineers. The minimum mapping unit, defined as the smallest specified area for mapping an individual landform, is 0.25 acres. Data Format Availability The data is available for distribution in 2 formats, as follows: a) Erdas Imagine raster format of the original polygon segments, with additional estimated extents of tidal/tidally impaired areas incorporated. Cell resolution is 1 meter square. ArcGIS layer (.lyr) files are provided. The files are as follows: i) Raster image: ep_020712_td_final.img (approx file size: 16.5 GB) ii) ArcGIS 10 layer file with symbology: ep_020712_td_final_Arc10.lyr iii) ArcGIS 9.3 layer file with symbology: ep_020712_td_final_Arc93.lyr b) Polygon version of the Erdas Imagine raster described in a) above, incorporating the estimated extents of tidal/tidally impaired areas. ArcGIS layer (.lyr) files are provided. The files are as follows: i) ArcGIS polygon segments shapefile: ep_020712_td_polygons_Arc10.gdb (approx. file size: 460 MB) ii) ArcGIS 10 layer file with symbology: ep_020712_td_polygons_Arc10.lyr Special note on data availability: the original polygon segments, before tidal information was incorporated, can also be obtained from the estuary partnership by special request. However, this file is not described here. Data Delivery Format All data described above is packaged into a .7z file format to compress file sizes for distribution over ftp. To extract the data files from the .7z format, users will require file compression software capable of processing the .7z. The recommended package is the open source Windows utility 7-zip. This free software can be downloaded from the following url: http://www.7-zip.org/ Installation of the 7-zip software is straightforward. Data Classification and Classification Schemes The classification includes detailed estuarine wetland type categories, limited land use categories (agriculture, urban use), as well as an approximation of tidally influenced, tidally impaired (diked, or blocked by tidegate, culvert, etc), and non-tidal wetland areas. A separate document describing the process used for estimating tidal/tidally impaired/non-tidal extents is also available for download, or directly from the Estuary Partnership: Tidal_Layer_metadata.doc The classification scheme that is used varies slightly with the incorporation of the tidal/diked/non-tidal information. Thus, the raster layer which incorporates this information has a slightly different scheme than the polygon segments and non-tidal raster. The 2 schemes are as follows: A) Data layers with no tidal information: 10 - coniferous upland forest 11 - deciduous upland forest 21 - coniferous wetland forest 22 - deciduous wetland forest 40 - upland shrub-scrub 41 - wetland shrub-scrub 50 - upland herbaceous 51 - wetland herbaceous 60 - aquatic bed 70 - agriculture 71 - tree farms 80 - bare 81 - mud 82 - sand 84 - rock 90 - urban, impervious surface 91 - urban, open space developed 93 - water B) Data layers with tidal information: 10 - coniferous upland forest 11 - deciduous upland forest 23 - coniferous wetland forest - non-tidal 24 - coniferous wetland forest - tidally influenced 25 - coniferous wetland forest - tidally impaired 26 - deciduous wetland forest - non-tidal 27 - deciduous wetland forest - tidally influenced 28 - deciduous wetland forest - tidally impaired 40 - upland shrub-scrub 42 - wetland shrub-scrub - non-tidal 43 - wetland shrub-scrub - tidally influenced 44 - wetland shrub-scrub - tidally impaired 50 - upland herbaceous 52 - wetland herbaceous - non-tidal 53 - wetland herbaceous - tidally influenced 54 - wetland herbaceous - tidally impaired 60 - aquatic bed 70 - agriculture 71 - tree farms 80 - bare 81 - mud 82 - sand 84 - rock 90 - urban, impervious surface 91 - urban, open space developed 93 - water Data Projection All data use the NAD83 Oregon Statewide Lambert projection, with units of meters. Data Accuracy An accuracy assessment was performed on the data. To obtain this information, please contact Estuary Partnership staff as listed below. Final Report The final report describing the classification process is available from the Lower Columbia River Estuary Partnership (LCEP). It will be downoadable from the LCEP website in mid-2012. Funding All funding for the development of this data set were provided by the Bonneville Power Administration Authors The project was managed by the Lower Columbia River Estuary Partnership, with support provided by the National Oceanographic and Atmospheric Administration Coastal Change Analysis Program (NOAA-CCAP). The dataset was developed by the Portland, OR and Ann Arbor, MI offices of the Sanborn Map Company. Field support for collection of ground truthing data was provided by SWCA Environmental Consultants, Portland Oregon. Additional Information Please refer to the existing metadata file for additional information regarding this data set. Contact Information For additional information regarding the data, please contact the Lower Columbia Estuary Partnership: Keith Marcoe GIS Specialist, Lower Columbia River Estuary Partnership 811 SW Naito Parkway, Suite 410 Portland, OR 97204 503 226 1565 x230 kmarcoe@lcrep.org