Using INTAMAP

INTAMAP sample datasets

This page supplies several datasets which can be used to test the INTAMAP service. Some of the csv files have no header with column names, but take the form 'x-coordinate', 'y-coordinate', 'value', 'error [optional]'.

Using the simple web client, datasets with no error column will currently be handled using the 'automap' function of the INTAMAP WPS. Datasets with an error column will be handled using the 'psgp' function. These files may also be used as test cases for the INTAMAP API, where users may explicitly control the kriging option used.

Satellite data: Vertical tropospheric column density of nitrogen dioxide.

Map showing the pattern of pixel measurements across the UK Map showing the pattern of pixel errors across the UK

Satellite data obtained from OMI on 02/06/2007 : units are 10 15 molecules per cm2. Left image shows tropospheric vertical column density of NO2. Right image shows the estimated error range for these values.

This dataset consists of 1677 point measurements, gathered from the OMI (Ozone Monitoring Instrument) and processed and published by Netherlands Agency for Aerospace Programs (NIVR) via the TEMIS website. The projection is British National Grid (EPSG 27700).

For this dataset, values are calculated using the procedure described in Boersma et al,(2007), Near-real time retrieval of tropospheric NO2 from OMI, Atm. Chem. Phys., 2013-2128.

An estimate of error is also available, as a fourth column representing standard deviation values. These errors have been calculated using the procedure described in Boersma, K.F., H.J. Eskes and E.J. Brinksma, 2004. Error analysis for tropospheric NO2 retrieval from space. J. Geophys. Res., 109, 4311, doi: 10.1029/2003JD003961

NB: the simple client requires pasted error values in the form of standard deviations (which are present in the csv files): however, the O&M document for this example converts these to variances (in the xml files).