Atmospheric data access for the geospatial user community

Index

NEWS

12-05-2017
ADAGUC Workshop 7 June 2017
KNMI organizes a 1-day workshop to provide hands-on experience with the ADAGUC software suite. Please check the announcement for the programme and how to signup.
12-05-2016
EGU, Geobuzz and Eumetsat
The latest presentations and posters from EGU, Geobuzz and Eumetsat have been added. See the presentations section here.
30-03-2015
ADAGUC Workshop 17-19 June 2015
KNMI organizes a 3-day workshop to provide hands-on experience with the ADAGUC software suite. Please check the announcement for the programme and how to signup.
03-11-2014
Application of polar orbiters with Pytroll and ADAGUC
Demonstration of Pytroll and ADAGUC displaying Suomi NPP Viirs. Read more here.
20-06-2013
Results ADAGUC Workshop 2013
KNMI has organized a 3-day workshop to get hands-on experience with the ADAGUC software suite: workshop June 2013.
16-04-2013
ADAGUC Workshop 17-19 June 2013
KNMI organizes a 3-day workshop to get hands-on experience with the ADAGUC software suite. Please read the announcement for the programme and how to signup.
29-03-2013
ADAGUC and OGC at KNMI
Status of ADAGUC and OGC services at KNMI.
18-09-2012
Launch of MSGCPP website
Launch of new website offering real-time MSG-CPP products using ADAGUC technology: http://msgcpp.knmi.nl/.
16-05-2010
Update of the precipitation service
The radar precipitation service has been updated. Besides better compliance to the WMS 1.1.1 specification, the Google Maps projection is now supported.
28-04-2009
ADAGUC presentations at EGU 2009
The ADAGUC presentations given at the EGU in Vienna are now online. You can access them here.
02-04-2009
Radar precipitation service available
The KNMI radar precipitation composite is now available in realtime through the ADAGUC services. The service can be found here.

16-02-2009
ADAGUC Products Standard V1.1 is now available
The ADAGUC Product Standard document (v1.1) is now publicly available.
09-12-2008
Presentations ADAGUC workshop 2008 available online
The presentations can be found in the
documentation section
04-12-2008
Final ADAGUC workshop
December 4-5 at VU, Amsterdam.
Workshop Announcement
03-10-2008
ADAGUC Products Standard V1.0 is now available
The ADAGUC Product Standard document (v1.0) is now publicly available.
22-08-2008
ADAGUC driver on GDAL Wiki (v0.1)
In agreement with Frank Warmerdam Maarten Plieger created an ADAGUC wiki on osgeo.org where the ADAGUC GDAL NetCDF4 driver can be found.
28-04-2008
ADAGUC presentations at EGU 2008
The presentations of the ADAGUC talks and posters at the EGU in Vienna are now online. You can access them here.
13-04-2008
ADAGUC at EGU 2008 - General Assembly & Congress in Vienna
3 talks and 3 posters will be presented by ADAGUC members
11-04-2008
First ADAGUC demonstrator service is available
Example datasets can be viewed and downloaded here
21-12-2007
Use Case and User Requirements documents published
The use case document (v2.1) and user requirements document (v1.3) are now publically available: Use cases V2.1, User Requirements v1.3
23-04-2007
ADAGUC at the ENVISAT 2007 conference
At the ENVISAT symposium 2007 in Montreux a poster is presented with goals and status of ADAGUC
16-04-2007
ADAGUC at EGU General Assembly 2007 in Vienna
Goals and current status of ADAGUC will be presented in an oral presentation
13-03-2007
ADAGUC at National Geo Information Days in Rotterdam
ADAGUC presented 2 posters to the Dutch Geoinformation community in the former van Nelle factory in Rotterdam. more
08-12-2006
ADAGUC success in Geo-Connected
ADAGUC will receive an additional grant for a top-up project, dealing with climate and forecast data. The Geo-Connected tender has been issued by RGI to establish bridges between research programs.
01-11-2006
Presentations workshop 2006 online
The presentations of the ADAGUC workshop are now online. You can access them here.

Product description of the KNMI precipitation radar


KNMI precipitation radar Product description

1. Identification

1.1. Product description

1.1.1. Abstract

Radar precipitation measurements above the Netherlands on a 1.0x1.0 km grid. The measurements are available in a five minute time interval, the intensity is in kg/m2/hour (mm/hour). The dataset is created from KNMI RAD_NL25_PCP_NA files. For interoperability, the original unit reflectivity in DBZ is converted to precipitation flux in kg/m2/h. The conversion from dbZ to kg/m2/h is applied with the formula R = 10^((PixelValue -109)/32).

1.1.2. Purpose

The dataset has been developed to monitor precipitation intensity above the Netherlands

1.1.3. Application

The precipitation data can be used for visualization.

1.2. Time period of content

1.2.1. Time period of content

January 2008 till today.

1.2.2. Currentness reference

Actual time of observation.

1.3. Status

1.3.1. Progress

Complete and validated.

1.3.2. Maintenance and update frequency

Continuous, data is available in a five minute time interval.

1.4. Spatial Domain

1.4.1. Bounding coordinates

Local coverage: the measurements are available for the Netherlands:

Product corners are 0.0, 49.36206, 0.0, 55.973602, 10.856429, 55.388973, 9.00928, 48.8953

1.5. Keywords

1.5.1. Theme

Radar Precipitation

1.5.2. Place

The Netherlands

1.5.3. Stratum

Troposphere.

1.5.4. Temporal

Recent

1.6. Access constraints

None.

1.7. Use constraints

None.

1.8. Point of contact

Royal Netherlands Meteorological Institute (KNMI): adaguc at knmi.nl

1.9 Citation

1.9.1. Originator

Royal Netherlands Meteorological Institute (KNMI)

1.9.2. Publication date

February 2009

1.9.3. Title

RADNL_OPER_R___25PCPRR_L3 - Radar precipitation above the Netherlands

1.9.4. Edition

Version 1.0.

 

1.10 Preview

Figure 1. Visualization of the KNMI precipitation radar, above the Netherlands. Image obtained with the ADAGUC WMS service of the KNMI precipitation radar.

1.11 Unique identifiers

Source data unique identifier:

iso_dataset:uid = "677368fe-e868-4b38-bebb-abb603f2df8f"

Metadata identifier:

iso_dataset:metadata_id = "00158fa4-a64f-4705-9eb4-c5be8ef41543"

 

1.12. Data set credit

H. Beekhuis, I. Holleman

1.13. Cross reference

Holleman, I., Bias adjustment of radar-based 3-hour precipitation accumulations

KNMI publication: TR-290, 11/10/2006, pp56.

 

Overeem, A., T.A. Buishand and I. Holleman, Rainfall depth-duration-frequency curves and their uncertainties J. Hydrol., 2008, 348, 1, 124-134, doi:10.1016/j.jhydrol.2007.09.044.

 

Holleman, I., Bias adjustment and long-term verification of radar-based precipitation estimates

Meteorological Applications (Royal Met. Society), 2007, 14, 195-203.

1.14. Literature

Doviak, R. J. and D. S. Zrni'c: 1993, Doppler Radar and Weather Observations. Academic

Press, second edition, 562 pp.

 

Tapping, K.: 2001, Antenna Calibration Using the 10.7cm Solar Flux. Workshop on Radar

Calibration, Albuquerque NM, AMS.

 

WMO: 1996, Guide to Meteorological Instruments and Methods of Observation, No. 8. Secre-

tariat WMO, Geneva, Switzerland, sixth edition.

 

Holleman, I. and H. Beekhuis, Review of the KNMI clutter removal scheme

KNMI publication: TR-284, 2005.

 

Holleman, I., Bias adjustment and long-term verification of radar-based precipitation estimates

Meteorological Applications (Royal Met. Society), 2007, 14, 195-203.

 

Holleman, I., Echotops for annotation on radar imagery

KNMI publication: TR-299, 15/5/2008, pp28.

 

Holleman, I., A. Huuskonen, M. Kurri and H. Beekhuis, Monitoring of weather radar receivers using solar signals detected in operational scan data

submitted, J. Atm. Oceanic Technol., 2008.

2. Data Quality

2.1 Lineage

2.1.1. Source information

Precipitation measurements obtained with two radars from the Royal Netherlands Meteorological Institute (KNMI, http://knmi.nl)

2.1.2. Processing steps

2.1.2.1. Processing description

KNMI operates two radars used for measurement of precipitation over The Netherlands and surroundings.

These C-band Doppler radars, emitting and receiving Radio-waves with a frequency of about 5.6 GHz, can be used in two different ways: as a conventional weather radar where the intensity of the received, scattered radio-waves is measured, and as a genuine Doppler radar where the radial velocity distribution of the scattering particles is measured. In a conventional radar the received, scattered signal is, after calibration and correction (for distance, atmospheric absorbtion etc.) converted to the quantity Z, the so-called radar reflectivity. For these files the quantity Z is converted to precipitation rate in mm/hour. Every 5 minutes the antenna of the radar performes at 15 elevations (tilting with respect to the horizontal plane) a full turn about his vertical axis (azimuth). (the azimuth is the clockwise angle of the radar antenna with respect to the direction of North). This results in a volume scan containing reflectivity and radial velocity as a function of the distance at every position of the radar antenna. The radar precipitation intensity images are a horizontal cross-section at constant altitude above the earth surface through the three-dimensional data converted to rain-intensity. They are called pCAPPI's, or pseudo-Constant-Altitude Plan-Position Indicator. The RAD_NL25_PCP product is the composite of the pCAPPI products generated by both radars. For interoperability, the original unit reflectivity in DBZ is converted to precipitation flux in kg/m2/h.

2.1.2.2. Algorithms used

The original unit reflectivity in DBZ is converted to precipitation flux in kg/m2/h with the formula R = 10^((PixelValue -109)/32).

2.1.2.3. Ancillary data

2.1.2.4. Processing date

Continuously.

2.1.2.5. Data validation

3. Spatial Data Organization

3.1. Indirect Spatial Reference

Map covers the Netherlands.

3.2. Direct Spatial Reference Method

Raster.

3.3. Point and vector object information

N/A

3.4. Raster object information

3.4.1. Row count

765

3.4.2. Column count

700

3.4.3. Vertical count

1

4. Spatial Reference

4.1. Coordinate System

4.1.1. Geographic coordinate units

Kilometer

4.1.2. Map projection

Stereographic

4.1.3. Datum

The earth's ellipsoid is described with a semi major axis of 6378.14 km and a semi minor axis of 6356.75 km. This is the same Earth model as used by WGS84

4.1.4. EPSG Code

NA

4.1.5. PROJ4 parameters

"+proj=stere +lat_0=90 +lon_0=0 +lat_ts=60 +a=6378.14 +b=6356.75 +x_0=0 y_0=0"

 

 

5. Product Description Reference Information

5.1. Product Description Date

02-03-2009

5.2. Product Description Review Date

02-03-2009

5.3. Product Description Contact

ADAGUC: adaguc at knmi.nl