| ArcGIS REST Services Directory |
| Home > services > HCP_StreamBuffers_Terrainworks_NonEditView (FeatureServer) > All Layers and Tables | | API Reference |
Linework from Terrainworks, buffers created by SF GIS using the BuffClass field, and keeping all bufferwidths consistent with Terrainworks 120 buffers with the exception of the N_DF_Temp and N_HE_Temp which was set to 50'. Linework from synthetic channel network traced from National Hydrographic Dataset 1/3-arc-second DEM. Conflated to Hydrography_Statewide_StreamsFP (https://www.oregon.gov/ODF/AboutODF/Pages/MapsData.aspx) for fish presence/absence, flow duration (perennial/seasonal) and stream size (small, medium, large). Channels classified based on riparian buffer rules defined by channel attributes (fish presence/absence, perennial/seasonal flow, size, debris-flow prone, high-energy); buffer definitions are provided with the field descriptions. This feature class used 120' for buffers within the temperature zone. Each reach has a variety of associated data attributes, including BufClass (buffer class) and Buffer (buffer width). The buffer width value includes the specified width for the type of riparian buffer plus one half the estimated channel width. The Buffer field is used to define riparian-zone buffers to build a buffer polygon feature class. Reach breaks are placed where ever the buffer width + one-half channel width value changes by a fraction of a meter.
Buffers based on "buffer" field in the ODF_buffers_neha_TBuf_120 feature class and the AqauticZone_neha polygon, which delineates the aquatic zone based on a two-times channel depth height-above channel. Channel reaches are buffered by an amount specified by the "buffer" field in the ODF_buffers_neha_TBuf_120 attribute list, which includes the defined buffer width plus one half the channel width. The aquatic zone receives a 120' (36.576m) buffer. The channel and aquatic-zone buffers were merged, dissolved, and clipped to State Lands to produce this polygon feature class.