Description: This dataset represents stream centerline based on: -flow accumulation and flow path modeling using 2004 - 2008 LiDAR-derived surface elevation data -2 foot contour datasets derived from LiDAR elevation data -2006 1 foot resolution and 2007 0.5 foot resolution aerial photo (ADS) imagery. Watershed Sciences, Inc. created this dataset for Metro regional government, Oregon.
Description: The National Flood Hazard Layer (NFHL) data incorporates all Flood Insurance Rate Map (FIRM) databases published by the Federal Emergency Management Agency (FEMA), and any Letters of Map Revision (LOMRs) that have been issued against those databases since their publication date. It is updated on a monthly basis. The FIRM Database is the digital, geospatial version of the flood hazard information shown on the published paper FIRMs. The FIRM Database depicts flood risk information and supporting data used to develop the risk data. The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual-chance flood event, and areas of minimal flood risk. The FIRM Database is derived from Flood Insurance Studies (FISs), previously published FIRMs, flood hazard analyses performed in support of the FISs and FIRMs, and new mapping data, where available. The FISs and FIRMs are published by FEMA.The NFHL is available as State or US Territory data sets. Each State or Territory data set consists of all FIRM Databases and corresponding LOMRs available on the publication date of the data set. The specification for the horizontal control of FIRM Databases is consistent with those required for mapping at a scale of 1:12,000. This file is georeferenced to the Earth's surface using the Geographic Coordinate System (GCS) and North American Datum of 1983The original datasets was downloaded from here: https://msc.fema.gov/portal/availabilitySearch?addcommunity=410181&communityName=GRESHAM (Effective Product/NFHL Data-County/NFHL_14051C/"S_FLD_HAZ_AR.shp" in 2/4/2019)
Description: This dataset represents 10 foot contours based on 2007 and 2008 LiDAR-derived surface elevation data. This dataset was derived from the 2 foot contours, from which the 10-ft intervals were selected, dissolved, and merged into a single feature class. A smooth tool was used on this feature class to optimize performance with online mapping applications.
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Description: (Planning) Historical and Cultural Landmarks Overlay District. Maps specific sites which have been designated as landmarks by the council using speciifc criteria (in the Development Code). Includes all property north of I84 to protect Indian sites during development
Description: The High Slope Subarea (HSS) is a subarea of the Hillside and Geologic Risk Overlay (HGRO). The HSS is based on DOGAMI Metro 2014 Lidar-derived bare-earth DEM data. The HSS is the areas within the HGRO which have generalized slopes of 35% and greater. Generalized slopes are created by using Focal Statistics to average slope for each raster cell (of the bare earth DEM converted to slope percent rise raster). Focal Statistics were calculated using averaged across a circle with radius specified as 15 cells (45 feet). Prior to focal statistics, a narrow quality control clipping is performed to remove identified slopes with either underlying data quality issues or areas of slope no longer accurate as of January 15 2021 due to capture of temporary slope features (e.g. stockpiles) which are no longer present. Finally a 5 foot buffer is added. The overlay boundary identifies locations where Gresham Community Development Code (GCDC) Section 5.0200 Hillside and Geologic Risk Overlay (HGRO) standards relating to the High Slope Subarea (HSS) apply. For more information on GCDC including Section 5.0200, visit https://greshamoregon.gov/Development-Code/.
Description: The Hillside and Geologic Risk Overlay (HGRO) is the City of Gresham’s implementation of State of Oregon Statewide Planning Goal 7 (Natural Hazards) relating to landslides. The HGRO geography is based on DOGAMI's IMS-57 landslide mapping and landslide hazard modeling (shallow and deep landslides), DOGAMI Metro 2014 Lidar-derived bare-earth DEM, and City of Gresham stream data. The overlay boundary identifies locations where Gresham Community Development Code (GCDC) Section 5.0200 Hillside and Geologic Risk Overlay (HGRO) standards apply. For more information on GCDC including Section 5.0200, visit https://greshamoregon.gov/Development-Code/.
Description: The High Value Resource Area (HVRA) is a subarea of the Resource Area (RA) and part of the Natural Resource Overlay (NRO). This overlay boundary identifies locations where Gresham Community Development Code (GCDC) Section 5.0700 Natural Resource Overlay (NRO) standards relating to the High Value Resource Area (HVRA) apply.The HVRA represents Title 3 and Title 13 water resource inventories of wetlands, streams, and other waters and buffers thereof at 35-50 feet in width depending on location in the City or Planning District.
Description: The Resource Area (RA) is part of the Natural Resource Overlay (NRO). This overlay area boundary identifies locations where Gresham Community Development Code (GCDC) Section 5.0700 Natural Resource Overlay (NRO) standards relating to the Resource Area (RA) apply. For more information on the GCDC including Section 5.0700 please visit https://greshamoregon.gov/Development-Code/.Protected resources include Title 3 and Title 13 resources including upland habitat, wetlands, wetland buffers, streams, stream buffers or riparian areas, other waters, and other waters buffers.
Description: The Potential Resource Area (PRA) is part of the Natural Resource Overlay (NRO). This overlay boundary identifies locations where Gresham Community Development Code (GCDC) Section 5.0700 Natural Resource Overlay (NRO) standards relating to the Potential Resource Area (PRA) apply.Potential Resource Areas are relevant to wetlands. Areas were designated as PRAs based on a high probability of there being one or more unmapped wetlands, according to prior nearby wetland studies or recent observations.
Description: Significant Upland Habitat Areas which were identified as discrete upland habitats of importance in either the Pleasant Valley Master Plan or the Springwater Master Plan. These areas are regulated as RA under the Natural Resource Overlay.
Description: Inventory of wetlands in Gresham focusing on Title 13 wetlands regulated under the Natural Resource Overlay. Data is sourced from NWI, LWI, DSL-concurred wetland delineations, and other sources. Data conforms to Oregon Wetland Mapping Standard Version 2.1.1.
Description: FOR INTERNAL USE ONLY (incomplete dataset). Gresham tree includes significant trees, street trees,and legacy trees. Locations determined using a combination of aerials, asbuilts and GPS .
Description: OR051 Version 16, 09/17/2018.Gresham natural resources staff populated soil description of this data.This data set is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey. The information was prepared by digitizing maps, by compiling information onto a planimetric correct base and digitizing, or by revising digitized maps using remotely sensed and other information. This data set consists of georeferenced digital map data and computerized attribute data. The map data are in a soil survey area extent format and include a detailed, field verified inventory of soils and miscellaneous areas that normally occur in a repeatable pattern on the landscape and that can be cartographically shown at the scale mapped. A special soil features layer (point and line features) is optional. This layer displays the location of features too small to delineate at the mapping scale, but they are large enough and contrasting enough to significantly influence use and management. The soil map units are linked to attributes in the National Soil Information System relational database, which gives the proportionate extent of the component soils and their properties.
Service Item Id: ace476b0f41140dcba27feb681fdb187
Copyright Text: USDA NRCS - data clipped by Gresham GIS to the current city urban plan boundary.
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