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update README.md

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brownag committed Nov 7, 2019
1 parent eaaf7ce commit 4c72d4e1e6baf7281904bd45d24642e37ccbdde8
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  1. +3 −3 PhotoGeotagExtractor/README.md
@@ -1,13 +1,13 @@
# PhotoGeotagExtractor
### Author: andrew brown
### Author: Andrew G. Brown
### Version: 0.4
### Last update: 2019/11/06

Extract EXIF Geotag information from JPEG files, and use it to sort/cluster site photos using a shapefile containing known site locations (e.g. NASIS sites)

Now using all _native *R* code_!

Relies on my fork of [cmartin/EXIFr](https://github.com/cmartin/EXIFr), which adds parsing functionality for a much broader set of TIFF IFD tags than the original.
Relies on my fork of [cmartin/EXIFr](https://github.com/cmartin/EXIFr), [brownag/EXIFr](https://github.com/brownag/EXIFr), which adds parsing functionality for a much broader set of TIFF IFD tags than the original -- including all GPS tags.

Note that `EXIFr` is NOT the same package as `exifr`, which can be found on CRAN. `exifr` relies on either an external Perl library, or a compiled executable, neither of which are an option on USDA Common Computing Environment.

@@ -37,7 +37,7 @@ device_projection <- '+proj=longlat +datum=WGS84 +ellps=GRS80'
# [currently not supported] device_timezone - convert image timezone to local timezone
device_timezone <- Sys.timezone()
# threshold_distance - maximum distance of image cluster centroids to related points in point_layer
# threshold_distance - maximum distance (meters) of image cluster centroids to related points in point_layer
# NOTE: when calculating image centroids, _half_ the threshold_dist is used to define clusters
threshold_dist <- 100

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