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Description: Contour lines developed by vendor MAPCON during the partnership project with King County and E-Gov Cities for the acquisition of 2012 Aerial Photography, DTM (contours) and Planimetric data. It is considered to be detailed contour-grade surface elevation. This 10-ft elevation was extracted from the Contour2Feet_2012AerialDTM layer. This data was developed for internal use by the City of Mercer Island and are intended to be a general purpose digital reference tool. Independent verification of all data contained in this product should be obtained by any user of the product. These data sets are not an accepted legal instrument for describing, establishing, recording, or maintaining descriptions for property concerns or boundaries. The City makes no representation or warranty with respect to the accuracy or currency of these data sets, especially in regard to labeling of surveyed dimensions, agreement with official sources such as records of survey, or mapped locations of features. The City disclaims any warranty of merchantability of the data set or fitness for a particular use by the recipient, express or implied. The data set is furnished "AS IS" and "WITH ALL FAULTS, ERRORS AND DEFECTS," and recipient assumes all responsibility for use thereof. The City shall not be liable under any circumstances for any lost profits, lost savings, or any other incidental or consequential damage which may arise from any use of the data set. The recipient shall indemnify, hold harmless, and defend the City against any and all claims, causes of actions, losses, damages, attorney's fees, expenses (including any attorney fees incurred by the City) which may be sustained or asserted against the City arising from, or in any way connected to, the use by the recipient, its officers, employees, agents, assigns and successors of the data set provided by the City.
Copyright Text: Mapcon, King County GIS, City of Mercer Island GIS
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Description: Polygons cover any point on the island where there exists another point within a 40 foot radius that has an elevation difference of more than 12 feet .Steps used to create feature class:1. Create grid of points, 4 foot on center, covering the entire island (approx 11 million records)2. Join elevation data to points from surface (2016 Geoterra Lidar)3. Create grid of 200 foot squares, each buffered 40 feet for overlap. (The script was failing when trying to process the entire island- broke up into smaller squares to be considered one at a time.)4. Run script in project folder, which selects a point, evaluates it against every point within 40 feet, and returns "1" if high slope condition is met, or "0" if not. (Script currently located in M:/ArcMap Documents/DSG/ForHolly/2019 Tree Slope Permit)5. Buffer "1" points, merge and smooth until it looks good (we weren't going for extreme accuracy)