The New York State GIS Program Office (NYSGPO) is pleased to announce that we updated the web service for hydrography data in New York State.   This hydrography dataset is a subset of the National Hydrography Dataset (NHD) that loads filtered subsets of the NHD Waterbody, NHD Area, and NHD Flowline.  We offer two map services (one solid fill, one hollow fill) that the end user can choose from, both services hit the same underlying data.   These services are also scale trigger for waterbody size and labeling, more information about what is filtered out and what is scaled triggered is available in the service description of each service.

NYS Hydrography (MapServer) https://elevation.its.ny.gov/arcgis/rest/services/NYS_Hydrography/MapServer

NYS Hydrography Hollow Fill (MapServer) https://elevation.its.ny.gov/arcgis/rest/services/NYS_Hydrography_HollowFill/MapServer

Since the web service was created the NYS GIS Program Office has taken on State Stewardship responsibilities for the USGS NHD Dataset.  We have made the following changes over the past two months.  Although NHD Waterbody was our primary focus we did edit NHD Flowline as needed.   We have also edited the web service to now show intermittent ponds which we define as ponds that may/may not have water in them depending on the time of year.

HUC 02050102 – Chenango

  • 5,000 ponds added to the dataset via missing LiDAR breaklines, and heads up digitizing from most recent orthoimagery
  • 275 outdated geometry removed (ponds that no longer exist)
  • 500 replaced/edited geometry – replaced with lidar breaklines or edited existing geometry
  • 100 Attribute changes – mostly Perennial ponds reclassified to Intermittent.

HUC 02030201 – Northern Long Island

  • 260 Ponds added to the dataset via missing LiDAR breaklines, and heads up digitizing from most recent orthoimagery
  • 100 outdated geometry removed (ponds no longer exist)
  • 500 replaced/edited geometry – replaced with lidar breaklines or edited existing geometry
  • 100 Attribute Changes

HUC 02050101 – Upper Susquehanna

– We have updated this HUC and are awaiting approval from USGS,  once this data goes live the Web Service will be updated.

 

Please let me know if you have any questions.

Thanks,

Jeff Langella

Jeffrey Langella

GIS Program Office

Office of Information Technology Services

10B Airline Drive

Albany, NY 12235

Phone (518)242-5037

Fax (518) 322-4976

Jeffrey.Langella@its.ny.gov

www.its.ny.gov

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