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## Overview
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**`modisfast`** is an R package designed for **easy** and **fast** downloads of [**MODIS**](https://lpdaac.usgs.gov/data/get-started-data/collection-overview/missions/modis-overview/) Land products, [**VIIRS**](https://lpdaac.usgs.gov/data/get-started-data/collection-overview/missions/s-npp-nasa-viirs-overview/) Land products, and [**GPM**](https://gpm.nasa.gov/data/) (Global Precipitation Measurement Mission) Earth Observation data.
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**`modisfast`** is an R package designed for **easy** and **fast** downloads of [**MODIS**](https://lpdaac.usgs.gov/data/get-started-data/collection-overview/missions/modis-overview/) Land products, [**VIIRS**](https://lpdaac.usgs.gov/data/get-started-data/collection-overview/missions/s-npp-nasa-viirs-overview/) Land products, and [**GPM**](https://gpm.nasa.gov/data) (Global Precipitation Measurement Mission) Earth Observation data.
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`modisfast` uses the abilities offered by the [OPeNDAP](https://www.opendap.org/about/) framework (*Open-source Project for a Network Data Access Protocol*) to download a subset of Earth Observation data cube, along spatial, temporal or any other data dimension (depth, ...). This way, it reduces downloading time and disk usage to their minimum : no more 1° x 1° MODIS tiles with 10 bands when your region of interest is only 30 km x 30 km wide and you need 2 bands ! Moreover, `modisfast` enables parallel downloads of data.
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a comparison of modisfast with other packages available for downloading
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chunks of MODIS or VIIRS data :
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| Package | Data | Available on CRAN | Utilizes open standards for data access protocols | Spatial subsetting\*| Dimensional subsetting\*| Maximum area size allowed for download | Speed\*\*|
|[`appeears`](https://github.com/bluegreen-labs/appeears)| MODIS, VIIRS, and many others |:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:| unlimited | variable |
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|[`MODISTools`](https://github.com/ropensci/MODISTools)| MODIS, VIIRS |:white_check_mark:|:x:|:white_check_mark:|:white_check_mark:| 200 km x 200 km |:white_check_mark:|
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|[`rgee`](https://github.com/r-spatial/rgee)| MODIS, VIIRS, GPM, and many others |:white_check_mark:|:x:|:white_check_mark:|:white_check_mark:| unlimited | not tested |
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|[`MODIStsp`](https://github.com/ropensci/MODIStsp)| MODIS |:x:||:x:|:white_check_mark:| unlimited | NA |
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|[`MODIS`](https://github.com/fdetsch/MODIS)| MODIS |:x:|:x:|:x:|:x:| NA | NA |
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|Package| Data | Available on CRAN | Utilizes open standards for data access protocols | Spatial subsetting\*| Dimensional subsetting\*| Maximum area size allowed for download | Speed\*\*|
|[`appeears`](https://github.com/bluegreen-labs/appeears)| MODIS, VIIRS, and many others |:white_check_mark:|:white_check_mark:|:white_check_mark:|:white_check_mark:| unlimited | variable |
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|[`MODISTools`](https://github.com/bluegreen-labs/MODISTools/)| MODIS, VIIRS |:white_check_mark:|:x:|:white_check_mark:|:white_check_mark:| 200 km x 200 km |:white_check_mark:|
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|[`rgee`](https://github.com/r-spatial/rgee)| MODIS, VIIRS, GPM, and many others |:white_check_mark:|:x:|:white_check_mark:|:white_check_mark:| unlimited | not tested |
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|[`MODIStsp`](https://github.com/ropensci/MODIStsp)| MODIS |:x:||:x:|:white_check_mark:| unlimited | NA |
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|[`MODIS`](https://github.com/fdetsch/MODIS)| MODIS |:x:|:x:|:x:|:x:| NA | NA |
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