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20260410
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ENVIRONMENTAL__wetlands_model07
2010-06-28T00:00:00
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The Snohomish County wetlands_model07 dataset was developed by the Snohomish County Conservation and Natural Resources – Surface Water Management Division as part of the Critical Area Regulation (CAR) program to comply with the State of Washington’s Growth Management Act (GMA). This model helps protect wetlands and their functions using the best available science.
The wetland model can be further improved by incorporating newer and higher-quality wetland data. Wetlands_model07 can be combined with GIS_FEATURES.GDBA.environmental_wetlands, GIS_FEATURES.GDBA.environmental_wetlands_nwi, and other site-specific wetland layers to support various planning and permitting projects.
<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>Snohomish County wetlands_model07 data set is a thematic layer depicting the modeled wetlands using various remote sensing data including LiDAR DEM, 2007 QuickBird satellite imagery, 2007-2008 PALSAR radar interferometry data, and various ancillary GIS layers (hydric soils, streamline data, etc.). LiDAR DEM is one of the most critical input data for the wetland model and was a compilation of multiple LiDAR sources collected in multiple years ranging from 2003 to 2006. The accuracy of LiDAR for some areas has known to be problematic, so does the final wetland products. The precise location of the wetland boundary must be determined by a site visit by a wetland biologist. </SPAN></SPAN></P></DIV></DIV></DIV>
Snohomish County Conservation and Natural Resources - Surface Water Management
Snohomish County
SWM
Wetland Model 07
<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>Forested wetlands were derived primarily from LiDAR-derived wetness probability index and error source in the wetness probability index is associated with the accuracy in forested wetland. Emergent and scrub/shrub wetlands can come from either high resolution satellite imagery alone or remote sensing-based model. Since high resolution satellite imagery was taken from July 31, 2007 </SPAN></SPAN><SPAN><SPAN>–</SPAN></SPAN><SPAN>September 5, 2007, ground condition in that time span affected wetland model. Therefore, caution should be taken in agricultural land as there were various agricultural practices performed and ground condition was dry during the imaging time span. Wetlands at/near the subbasin boundary area are subject to having errors since the wetness index was developed by subbasin. There are few areas with cloud cover in the satellite imagery used for developing the land cover data. Wetlands under cloud cover deem to have error. In conclusion, Snohomish County wetland data may be useful for planning purposes but not for site-specific analysis.</SPAN></P><P STYLE="margin:0 0 11 0;"><SPAN>All maps, data, and information set forth herein (“Data”), are for illustrative purposes only and are not to be considered an official citation to, or representation of, the Snohomish County Code. Amendments and updates to the Data, together with other applicable County Code provisions, may apply which are not depicted herein. Snohomish County makes no representation or warranty concerning the content, accuracy, currency, completeness or quality of the Data contained herein and expressly disclaims any warranty of merchantability or fitness for any particular purpose. All persons accessing or otherwise using this Data assume all responsibility for use thereof and agree to hold Snohomish County harmless from and against any damages, loss, claim or liability arising out of any error, defect or omission contained within said Data. Washington State Law, Ch. 42.56 RCW, prohibits state and local agencies from providing access to lists of individuals intended for use for commercial purposes and, thus, no commercial use may be made of any Data comprising lists of individuals contained herein.</SPAN></P></DIV></DIV></DIV>
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20260410
Gi-Choul Ahn
Snohomish County Conservation and Natural Resources
Principal GIS Analyst
Everett
WA
98201
US