Metadata for NDVI for Year 2002 to Present from AQUA Metadata for NDVI for Year 2002 to Present from AQUA

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Identification Information:

Citation:

Originator: Montana Climate Office
Publication date: 12/31/2014
Title: NDVI for Year 2002 to Present from AQUA
Edition: MCO_MODIS_13_v1.0_2014
Online linkage: ftp://mco.cfc.umt.edu/ndvi/aqua/Readme.html

Browse graphic file name: http://mco.cfc.umt.edu/images/MCOMODIS13Thumbnail.jpg
Browse graphic file description: Montana Climate Office MODIS13 graphic
Browse graphic file type: JPEG

Abstract:

This raster dataset shows MODIS AQUA sixteen-day, monthly, yearly, sixteen-day normal, monthly normal, and yearly normal Normalized Difference Vegetation Index (NDVI) for Montana with a nominal grid cell resolution of 250-meters for the sixteen-day products and 1000-meters for the monthly and yearly products for the years 2002 to present. The Normalized Difference Vegetation Index (NDVI) is an index of plant “greenness” or photosynthetic activity, and is one of the most commonly used vegetation indices. Vegetation indices are based on the observation that different surfaces reflect different types of light differently. Photosynthetically active vegetation, in particular, absorbs most of the red light that hits it while reflecting much of the near infrared light. Vegetation that is dead or stressed reflects more red light and less near infrared light. Likewise, non-vegetated surfaces have a much more even reflectance across the light spectrum. By taking the ratio of red and near infrared bands from a remotely-sensed image, an index of vegetation “greenness” can be defined. Starting 2000, and after the launch of the two MODIS sensors on the Terra and Aqua satellites by NASA, NDVI was adopted as a standard product. The Terra satellite collection encompasses the years 2000 to present. The Aqua satellite collection encompasses the years 2002 to present. The Montana Climate Office transforms the source MODIS datasets from their native sinusoidal projection to the Montana State Plane coordinate system for the area-of-interest for both the Aqua and Terra MODIS platforms. Technical details for MODIS can be found in the user guide posted at ftp://mco.cfc.umt.edu/resources/MCO/Papers/MODIS_VI_UsersGuide_01_2012.pdf

Purpose:

The Normalized Difference Vegetation Index (NDVI) for Montana is provided in gridded format. The Normalized Difference Vegetation Index (NDVI) is probably the most common ratio indices for vegetation. The biophysical interpretation of NDVI is the fraction of absorbed photosynthetically active radiation. Many factors affect NDVI values like plant photosynthetic activity, total plant cover, biomass, plant and soil moisture, and plant stress. Because of this, NDVI is correlated with many ecosystem attributes that are of interest to researchers and managers (e.g., net primary productivity, canopy cover, bare ground cover). Also, because it is a ratio of two bands, NDVI helps compensate for differences both in illumination within an image due to slope and aspect, and differences between images due things like time of day or season when the images were acquired. Thus, vegetation indices like NDVI make it possible to compare images over time to look for ecologically significant changes.

Supplemental information:

Processed from HDF raster file source using Python 2.7 code maintained by the Montana Climate Office.

Time period of content:

Beginning date: 07/04/2002
Beginning time: 000000
Ending date: 12/31/2014
Currentness reference:: The bounding rectangle for all 4th-code NRCS hydrologic units that intersect with the boundary of the State of Montana.

Status:

Progress: Complete
Maintenance and update frequency: As needed

Access constraints: None

Use constraints:

The Montana Climate Office (MCO) provides this product/service for informational purposes only. The MCO did not produce it for, nor is it suitable for legal, engineering, or surveying purposes. Consumers of this information should rndview or consult the primary data and information sources to ascertain the viability of the information for their purposes. The MCO provides these data in good faith but does not represent or warrant its accuracy, adequacy, or completeness. In no event shall the MCO be liable for any incorrect results or analysis; any direct, indirect, special, or consequential damages to any party; or any lost profits arising out of or in connection with the use or the inability to use the data or the services provided. The MCO makes these data and services available as a convenience to the public, and for no other purpose. The MCO reserves the right to change or rndvise published data and/or services at any time.

Point of contact:

State Climatologist
Director of Montana Climate Office
Montana Climate Office
32 Campus Drive
Missoula, Montana 59812-0576
Telephone: 406.243.6793
E-Mail: state.climatologist@umontana.edu

Point of contact:

Michael D. Sweet
Research and Information Systems Specialist
Montana Climate Office
32 Campus Drive
Missoula, Montana 59812-0576
Telephone: 406.243.5265
E-Mail: michael.sweet@umontana.edu

Data set credit:

The MODIS data product is courtesy of the online Data Pool at the NASA Land Processes Distributed Active Archive Center (LP DAAC), USGS/Earth Resources Observation and Science (EROS) Center, Sioux Falls, South Dakota (https://lpdaac.usgs.gov/data_access).

Data Quality Information:

Logical consistency report:

Value range resulting from bilinear transformation to Montana State Plane projection is within expected range. NoData values are assigned where they existed in the source representation.

Completeness report:

Number of NoData items with respect to the total number of NoData that should have been present

Lineage:

Process step:: MODIS data projected to Montana State Plane NAD83 is extracted to an area-of-interest (ftp://mco.cfc.umt.edu/resources/MCO/Area-of-Interest/BoundariesMSP.gdb/area-of-interest) defined by the Montana Climate Office to encompass all major sub-basins that intersect with Montana's border. The Esri ArcGIS Spatial Analyst ExtractByMask_sa method is used. For the extract method, the source is used as a snap raster to maintain alignment of the grid cells. Pyramids are built for the result using Esri ArcGIS BuildPyramids_management method.
Process step:: Mean and standard deviation are derived for all available years.

Spatial Data Organization Information:

Raster object information:

Raster object type: Pixel
Row count: 1099
Column count: 1529

Spatial Reference Information:

Horizontal coordinate system definition:

Map projection:

Map projection name: NAD 1983 StatePlane Montana FIPS 2500
Lambert conformal conic:

Planar distance units: meter

Geodetic model:

Horizontal datum name: D North American 1983
Ellipsoid name: GRS 1980
Semi-major axis: 6378137.0
Denominator of flattening ratio: 298.257222101

Entity and Attribute Information:

Entity type label:

MODIS gridded raster data representing mean Normalized Difference Vegetation Index

Entity type definition: MODIS Normalized Difference Vegetation Index mean values

Attribute label: Value

Attribute definition:: spatially gridded mean Normalized Difference Vegetation Index values
Range domain minimum: -1.0
Range domain maximum: 1.0
Attribute units of measure: NDVI
Attribute measurement frequency: 005

Distribution Information:

Distributor:

Michael D. Sweet
Research and Information Systems Specialist
Montana Climate Office
32 Campus Drive
Missoula, Montana 59812-0576
Telephone: 406.243.5265
E-Mail: michael.sweet@umontana.edu

Resource description: Downloadable Data

Distribution liability:

Standard order process:

Digital form:

Metadata Reference Information:

Metadata date: 02/17/2015

Metadata future Review date: 01/01/2016

Metadata contact:

Michael D. Sweet
Research and Information Systems Specialist
Montana Climate Office
32 Campus Drive
Missoula, Montana 59812-0576
Telephone: 406.243.5265
E-Mail: michael.sweet@umontana.edu

Metadata use constraints: