Flood 2013 Daily Rainfall

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Frequently anticipated questions:

What does this data set describe?

Title: Flood 2013 Daily Rainfall
The daily amount of rain that fell in Boulder County during the September Flood of 2013, from September 10 to September 16. Note that this feature class should either by time-enabled, or use definition queries for a specific date. This information was aquired by NOAA, Earth System Research Laboratory, Physical Science Division, Climate Analyis Branch, and taken from there web page titled Boulde area flood of September 2013: Precipitation. This information is from the Advanced Hydrological Prediction Service. The URL of the this page is <http://www.esrl.noaa.gov/psd/boulder/flood2013/precipplots> This page showed the daily (24 hour) accumlation precpitation fro the period starting 12 UTC 9/9/2013 and ending 12 UTC 9/16/2013. There is a 6 hour time difference from UTC to Mountain Daylight Time. This would mean that each map shows the 24 hour accumilation from 6PM the day before the date to 6PM the day indicated on the feature. Thus for features with a date of 9/12, the daily accumlation is from 9/11 6PM to 9/12 6PM.The images on the webpage data did not contain spatial reference information. In order to make the raster dataset usable and align with our existing spatial data layers, a process called georeferencing was used to transform the rasters.Process:The data was in .png file format and would need to be converted to .tif file for use in ArcMap.Add the raster dataset that you want to align in ArcMap.Add a layer that resides in your current map coordinates. For our purposes, the County boundary was used.Add the georeferencing toolbar.Using the georeferencing toolbar, Add control points that link known raster positions to your existing data.Save the georeferenced image when satisfied.Repeat for each of the precipitation rasters.Create feature classes for each raster timeframe.The following fields were added to record the precipitation amounts.RainfallMinRainfallMaxDigitize or sketch a polygon defining the features shape.Update the attributes for each field, using the precipitation amounts available in the raster legend.
  1. How should this data set be cited?

    , 20131112, Flood 2013 Daily Rainfall.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -105.695352
    East_Bounding_Coordinate: -105.049536
    North_Bounding_Coordinate: 40.264433
    South_Bounding_Coordinate: 39.912144

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: vector digital data

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • GT-polygon composed of chains (102)

    2. What coordinate system is used to represent geographic features?

      The map projection used is NAD 1983 HARN StatePlane Colorado North FIPS 0501.

      Projection parameters:
      Standard_Parallel: 39.71666666666667
      Standard_Parallel: 40.78333333333333
      Longitude_of_Central_Meridian: -105.5
      Latitude_of_Projection_Origin: 39.33333333333334
      False_Easting: 3000000.000316083
      False_Northing: 999999.999996

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.000000026926350038536387
      Ordinates (y-coordinates) are specified to the nearest 0.000000026926350038536387
      Planar coordinates are specified in foot_us

      The horizontal datum used is D North American 1983 HARN.
      The ellipsoid used is GRS 1980.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257222101.

  7. How does the data set describe geographic features?

    Daily Rainfall (Source: NOAA/ESRL Physical Sciences Division)

    Internal feature number. (Source: Esri)

    Sequential unique whole numbers that are automatically generated.

    Internal feature number. (Source: Esri)

    Sequential unique whole numbers that are automatically generated.

    Feature geometry. (Source: Esri)

    Coordinates defining the features.

    Minimum daily rainfall

    Maximum daily rainfall

    Rainfall Date

    Area of feature in internal units squared. (Source: Esri)

    Positive real numbers that are automatically generated.


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    Advanced Hydrological Prediction Service NOAA, Earth System Research Laboratory, Physical Science Division, Climate Analyis Branch

  3. To whom should users address questions about the data?

Why was the data set created?

Daily Rainfall from Flood 2013 for Boulder County, CO

How was the data set created?

  1. From what previous works were the data drawn?

  2. How were the data generated, processed, and modified?

  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None
This data is for illustrative purposes only and the features depicted on it are approximate. More site specific studies may be required to draw accurate conclusions. Boulder County makes no warranties regarding the accuracy, completeness, reliability, or suitability of this data. Boulder County disclaims any liability associated with the use or misuse of this map. In accessing and/or relying on this map, the user fully assumes any and all risk associated with the information contained therein.

Who wrote the metadata?

Last modified: 09-Jan-2014
Metadata author:
Boulder County Land Use Department

Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

Generated by mp version 2.9.12 on Thu Jan 09 09:29:45 2014