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How to use our NDVI WCS feeds in ArcMap replied by eti1206 @ Wed, 05 Oct 2011 11:02:01 -0000

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NDVI datasets via WCS replied by rigobertmaril @ Wed, 31 Aug 2011 10:20:15 -0000

rigobertmaril — Wed, 31 Aug 2011 10:20:15 -0000

Hello. We now have 2000 onward online. The urls for the services are based on a http://ndvi.gina.alaska.edu/{year}/modis
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How to use our NDVI WCS feeds in ArcMap replied by louisacheco @ Sat, 30 Jul 2011 02:55:20 -0000

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NDVI datasets via WCS replied by JayCable @ Tue, 27 Apr 2010 21:23:23 -0000

JayCable — Tue, 27 Apr 2010 21:23:23 -0000

We now AVHRR NDVI composites available via WCS. The data starts in spring of 1990 and runs though the fall of 2009. Before using the data be sure to check out the dataset’s documentation which explains how the data is scaled along with other important information.

The urls for the services are based on a scheme like: “http://ndvi.gina.alaska.edu/year/avhrr” were year is replaced by the year that is desired.

For example, the url for avhrr ndvi data for the year 2009 would be http://ndvi.gina.alaska.edu/2009/avhrr.

The data is available as biweekly and weekly composites, with the layer names telling the duration of the composite as well as the start and end date. For example, the layer “AK2009_07day244250” is a weekly composite and started on Julian Day 244 and ended on Julian Day 250.

Each layer contains 14 bands. Here is a quick overview of the data, but please refer to the documentation for more details.

Top of atmosphere Channel 1 reflectance (Calibrated, no atmospheric correction)
Top of atmosphere Channel 2 reflectance (Calibrated, no atmospheric correction)
Radiance
Temperature
Temperature
NDVI
Satellite zenith
Solar zenith
Relative azimuth
Atmospherically corrected Channel 1 surface reflectance
Atmospherically corrected Channel 2 surface reflectance
QA/QC
Date index
Cloud mask

Please let us know if you have any questions or have any suggestions as to how to make this service more useful.

NDVI datasets via WCS replied by JayCable @ Tue, 27 Apr 2010 21:07:20 -0000

JayCable — Tue, 27 Apr 2010 21:07:20 -0000

We now have 2000 onward on line. The urls for the services are based on a “http://ndvi.gina.alaska.edu/{year}/modis” scheme, so for example the url to the WCS with data for year 2003 would be http://ndvi.gina.alaska.edu/2003/modis.
Please let us know if you have any questions or suggestions.

How to use our NDVI WCS feeds in ArcMap replied by JayCable @ Thu, 11 Mar 2010 19:59:14 -0000

JayCable — Thu, 11 Mar 2010 19:59:14 -0000

Here is a very basic walk though on how to get our NDVI datasets into ArcMap. We are working on generating layer files, but right now users have to add the layers by hand.

Right click on “Layers” and select the “Add Data” dialog”
Select the “Add WCS Server” from the “GIS Servers” category and click “Add”.
In the URL field, enter “http://ndvi.gina.alaska.edu/2009/modis” and click “Ok”.
Click “Add”.
Select the layer (s) you would like to add to your map, and click “Add”.
You should now have the layer(s) displayed, with a listing of them on the left hand side. The display should be all black – don’t panic – ArcMap is not sure how to display this data, and defaults to a contrast stretch that ends up all black. This is easily fixed with the next step.
Right click on the layer you would like to adjust, and select the “Properties” item.
Select the “Symbology” tab, then adjust the Min to be -1999 (or some other reasonable value), and the Max to 10000, and select a colour scheme that makes sense for your purposes. Click “Apply” then “OK” to return to ArcMap.
You should now have the NDVI data displayed in your ArcMap session.

Please let us know if you have any questions, comments, or suggestions.

NDVI datasets via WCS replied by JayCable @ Thu, 11 Mar 2010 19:54:26 -0000

JayCable — Thu, 11 Mar 2010 19:54:26 -0000

We are currently publishing a Web Coverage Service with NDVI data covering Alaska derived from MODIS data and provided as weekly datasets. Currently we are only providing data for 2009, but soon will be adding 2000 onward in addition to some AVHRR derived NDVI datasets.

The URL for the 2009 NDVI datasets is “http://ndvi.gina.alaska.edu/2009/modis” – please try it out and let us know what you think.

For each week we are providing bands 1, 2, and the NDVI data at 250m resolution, and the date of acquisition, a snow mask, and all the standard bands at 500m resolution.

For example, for the week of Jan 29 – Feb 5, 2009 we are providing these layers:

MT3RG_2009_029_035_250m_ACQ
- Date of acquisition
MT3RG_2009_029_035_250m_Band1
MT3RG_2009_029_035_250m_Band2
MT3RG_2009_029_035_250m_BQ
- The snow mask
MT3RG_2009_029_035_250m_NDVI
MT3RG_2009_029_035_500m
- Contains the 7 MODIS 500m bands
MT3RG_2009_029_035_500m_BQ
- The snow mask

The data in the layers is the same as the standard eMODIS data products that are the source for this dataset. The complete documentation for the dataset can be found here . The values in the layers is intended to be consistent with the eMODIS products. For example, NDVI values in the layers range from 10,000 to -1,999 – to convert these to the standard 1.0 to -1.0 values multiply by 0.0001 . If you have more questions please read the documentation .

We currently have users using this service as an input to their ESRI based models and it appears to be working well for them.

As always, we would love to hear from folks – if you run into problems or have suggestions please let us know by posting here or emailing us at wms@alaskamapped.org .

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