Tag Archives: NHD
by Brad Cooper, INDUS Corporation, Member of the EPA/How’s My Waterway Team EPA’s new app and website, How’s My Waterway, helps people find information on the condition of their local waterways using a smart phone, tablet, or desktop computer. It … Continue reading
The NHD Update tool v6.0.0 for ArcGIS 10.1 is in the final testing phase and will be officially released in February. Subsequent versions of the ArcGIS 10.1 tool (v.6.0+) will include enhancements submitted by the stewardship community. Release date for the first v6.0+ will be one-two months out from the February v6.0.0 release. Note that only the most recent version of the NHD edit tool will be maintained/enhanced. Issues reported regarding earlier versions, will be tested in the latest Beta version and resolved as necessary.
Please check back to the Hydro Resource Center for the final release!
By: Erin Peterson, Research Scientist, CSIRO Division of Mathematics, Informatics & Statistics Jay Ver Hoef, Research Statistician, NOAA National Marine Mammal Laboratory Spatial Autocorrelation in Streams and Rivers: Tobler’s first law of geography states that, ‘‘Everything is related to everything else, … Continue reading
by Cynthia Deischer and Ray Postolovski
Juliet: “What’s in a name? That which we call a rose by any other name would smell as sweet.”
Romeo and Juliet meet in Shakespeare’s tale. They are predestined from the start because of their surnames. Juliet tells Romeo that a name is an artificial and meaningless convention. Meaning what matters is what something is, not what it is called. However in the geospatial community, a name is far from meaningless and what something is named is just as important as what something is. Continue reading
by Cindy McKay, Horizon Systems Corporation, Member of the EPA/USGS NHDPlus Team A national compilation of the WBD snapshots used to build NHDPlusV2 has been assembled and is posted at: http://www.horizon-systems.com/NHDPlus/V2NationalData.php The data is posted in both shapefile and File … Continue reading
by Tommy Dewald, USEPA Office of Water The National Hydrography Dataset Plus (NHDPlus) is a suite of geospatial products that build upon and extend the capabilities of the NHD (1:100,000 scale) by integrating it with the National Elevation Dataset (30M) … Continue reading
by Ernest To* – RPS Espey, Carissa Belsky – Crespo Consulting Services, Inc., David Harkins – RPS Espey,
Jim Patek – Parsons Corporation, Steve Stecher – Crespo Consulting Services, Inc., Mel Vargas – Parsons Corporation,
Jennifer Walker – Watearth, Inc.
* =corresponding author
Sedimentation in Texas reservoirs is a significant problem that affects both water availability and quality in Texas. The Texas Water Development Board estimates that Texas’ major reservoirs are losing 90,000 acre-feet per year due to sedimentation. This is equivalent to a loss of 4.5 million acre-feet by 2060 and exceeds the projected increase of 3.4 million acre-feet from new reservoirs. The reduction in storage volume not only impacts water supply but also necessitates the alteration of supply infrastructure to handle deteriorating water quality. Uncertainty regarding rainfall supply due to climate change further burdens the already stressed reservoirs.
by Ariel T. Doumbouya, NHD Team, United States Geological Survey
Fish sampling sites in the Nashua River Subbasin in Massachusetts are linked to the National Hydrography Dataset (NHD) as events using the Hydrography Event Management (HEM) Tools. Events allow scientific information to be linked to the NHD which provides a powerful modeling framework that can be used to locate water related information on the network, establish up and/or downstream relationships, perform habitat and species modeling, and determine relationships between other environmental factors.
by Kathy Isham, National Hydrography Dataset, USGS The US Geological Survey (USGS) has redesigned its applications page for the National Hydrography Dataset (NHD). The new applications page is organized into the six different types of applications that highlight how USGS … Continue reading
The USGS periodically reviews the NHD Data model to determine if changes are needed to better suit our community’s needs. These changes must be approved by a panel in order to ensure the NHD community will not be negatively impacted.
The updates to the NHD model are as follows:
1. Removed attribute ComID from all NHD feature classes and tables
- Removed FeatureComID from NHD event feature classes
- Remove d attribute AboveComID and BelowComID from NHDVerticalRelationships table
- Remove d attribute FromComID and ToComID from NHDFlow table
- Remove d attribute WBAreaComID from NHDFlowline feature class