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Hillside Management Areas (25 - 50%, and > 50% Slope) derived from a Digital Elevation Model (DEM). |
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Hillside Management Areas (25 - 50%, and > 50% Slope) derived from a Digital Elevation Model (DEM). |
| accessInformation:
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County of Los Angeles
Department of Regional Planning
GIS Section
LAR-IAC |
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5000 |
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[] |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN STYLE="font-weight:bold;font-size:14pt">Overview:</SPAN></P><P><SPAN STYLE="font-size:12pt">This layer shows Hillside Management areas, which are essentially anything with a 25% or greater slope. It is broken down by '25 - 50%', and 'greater than 50%' slope categories for all unincorporated areas with the following exceptions:</SPAN></P><UL><LI><P><SPAN STYLE="font-size:12pt">Forest land that is not a private inholding</SPAN></P></LI><LI><P><SPAN STYLE="font-size:12pt">Forest land outside of a CSD boundary</SPAN></P></LI><LI><P><SPAN STYLE="font-size:12pt">Forest land outside of unincorporated community boundaries that go into the forest</SPAN></P></LI></UL><P><SPAN STYLE="font-size:12pt">Deleted all polygons less than 25 sq. ft.</SPAN></P><P><SPAN STYLE="font-size:12pt">Below is a description of the source Digital Elevation Model and Slope that went into creating this dataset.</SPAN></P><P><SPAN STYLE="font-weight:bold;font-size:14pt">Digital Elevation Model / LAR-IAC 7:</SPAN></P><P><SPAN>This 1 meter Digital Elevation Model (DEM) is a model of surface elevation in the County of Los Angeles developed by the Los Angeles Regional Imagery Consortium (LAR-IAC). The LAR-IAC project encompasses the entire land area of Los Angeles County in mainland plus Catalina Island. The Area of Digital Elevation Model data developed over the Urban/Suburban area mainland covers approximately 4214 square miles. Tiles were downloaded in September, 2025 from the USGS National Map: </SPAN><A href="https://apps.nationalmap.gov/lidar-explorer/" target="_blank" STYLE="text-decoration:underline;"><SPAN>https://apps.nationalmap.gov/lidar-explorer/#/</SPAN></A><SPAN>. This dataset was re-projected from the original NAD83, UTM Zone 11N projection to State Plan, CA Zone V. The grid size is 3.28 x 3.28 feet to be equivalent to 1 meter.</SPAN></P><P><SPAN>Detailed product information (including accuracy report) is contained in the </SPAN><A href="https://apps.gis.lacounty.gov/static/hub/lariac_documents/LARIAC7/Documents_Data/LARIAC7_ProductGuide_Final.pdf" target="_blank" STYLE="text-decoration:underline;"><SPAN>LAR-IAC7 Product Guide</SPAN></A><SPAN>.</SPAN></P><P><SPAN>We highly recommend that you visit the </SPAN><A href="https://lariac-lacounty.hub.arcgis.com/" target="_blank" STYLE="text-decoration:underline;"><SPAN>LAR-IAC Project Website</SPAN></A><SPAN> to find a rich source of information about the data and the LAR-IAC program. The site includes project documents, full FGDC compliant metadata, data downloads of related GIS used to complete the project, sub-licensing information, sample imagery and data, and information about this acquisition.</SPAN></P><P><SPAN>GIS Data showing flight-date information is available from the LAR-IAC Project website site, and elsewhere in the </SPAN><A href="https://egis-lacounty.hub.arcgis.com/" target="_blank" STYLE="text-decoration:underline;"><SPAN>LA County GIS Data Portal</SPAN></A></P><P><SPAN STYLE="font-weight:bold;font-size:14pt">Update History:</SPAN></P><UL><LI><P><SPAN>11/30/15 - originally added to SDE</SPAN></P></LI><LI><P><SPAN>10/30/25 - Loaded into SDE and replaced the former version of Hillside Management that was generated in 2006.</SPAN></P></LI></UL></DIV></DIV></DIV> |
| licenseInfo:
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Internal Use only</SPAN></P></DIV></DIV></DIV> |
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| title:
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Hillside Management Areas - 2023 |
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| tags:
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["Hillside Management","HMA","DEM","LAR-IAC7","Elevation","Slope"] |
| culture:
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en-US |
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150000000 |
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