msgid "Ground control points can be set existing structures like pavement corners, lines on a parking lot or contrasting color floor tiles, otherwise can be set using targets placed on the ground."
msgid "Keep ground control points visible for all camera locations. Consider the expected ground sampling distance, illumination, vegetation, buildings and all the existing obstacles."
msgid "Procure an evenly horizontal distribution of the GCPs within the project, covering high and low elevations. A minimum of 5 GCP works for most of the jobs, and for larger projects 8 – 10 are sufficient. Locate some points near the corners and others in the center, considering that GCP spacing should be larger than the image footprint so that you can’t see more than one GCP in a single image."
msgid "In order to ensure each GCP are found in at least 5 images, separate the points 10 to 30 meters from the perimeter of the project. This distance is dependent of the overlapping, so increasing overlapping should reduce the required distance from the perimeter."
msgid "The first line should contain the name of the projection used for the geo coordinates. This can be specified either as a PROJ string (e.g. ``+proj=utm +zone=10 +ellps=WGS84 +datum=WGS84 +units=m +no_defs``), EPSG code (e.g. ``EPSG:4326``) or as a ``WGS84 UTM <zone>[N|S]`` value (eg. ``WGS84 UTM 16N``)"
msgid "Subsequent lines are the X, Y & Z coordinates, your associated pixels, the image filename and optional extra fields, separated by tabs or spaces:"
msgid "If you supply a GCP file called ``gcp_list.txt`` then ODM will automatically detect it. If it has another name you can specify using ``--gcp <path>``. If you have a gcp file and want to do georeferencing with exif instead, then you can specify ``--use-exif``. If you have high precision GPS measurements in your images (RTK) and want to use that information along with a gcp file, you can specify ``--force-gps``."
msgid "`This post has some information about placing Ground Control Targets before a flight <http://diydrones.com/profiles/blogs/ground-control-points-gcps-for-aerial-photography>`_, but if you already have images, you can find your own points in the images post facto. It's important that you find high-contrast objects that are found in **at least** 3 photos, and that you find a minimum of 5 objects."
msgid "The POSM GCPi is loaded by default on WebODM. An example is available at `the WebODM Demo <http://demo.webodm.org/plugins/posm-gcpi/>`_. To use this with known ground control XYZ values, one would do the following:"
msgid "Create a GCP list that only includes gcp name (this is the label that will be seen in the GCP interface), x, y, and z, with a header with a proj4 string of your GCPs (make sure they are in a planar coordinate system, such as UTM. It should look something like this:"
msgid "This app needs to be installed separately or can be loaded as a WebODM plugin from `https://github.com/uav4geo/GCPEditorPro <https://github.com/uav4geo/GCPEditorPro>`_"
msgid "Then import the CSV from the main screen and type ``+proj=utm +zone=37 +south +ellps=WGS84 +datum=WGS84 +units=m +no_defs`` in the ``EPSG/PROJ`` box."
msgid "`Learn to edit <https://github.com/opendronemap/docs#how-to-make-your-first-contribution>`_ and help improve `this page <https://github.com/OpenDroneMap/docs/blob/publish/source/gcp.rst>`_!"
