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        "author": "Michael Hirsch, Ph.D.",
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            "Development Status :: 5 - Production/Stable",
            "Environment :: Console",
            "Intended Audience :: Science/Research",
            "Operating System :: OS Independent",
            "Programming Language :: Python :: 3.6",
            "Programming Language :: Python :: 3.7",
            "Topic :: Scientific/Engineering :: Atmospheric Science"
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        "description": "[![Travis-CI](https://travis-ci.org/scivision/nexrad-quick-plot.svg?branch=master)](https://travis-ci.org/scivision/nexrad-quick-plot)\n[![Coveralls.io](https://coveralls.io/repos/github/scivision/nexrad-quick-plot/badge.svg?branch=master)](https://coveralls.io/github/scivision/nexrad-quick-plot?branch=master)\n[![AppVeyor Build Station](https://ci.appveyor.com/api/projects/status/jmiiyri2xqdvu5wm?svg=true)](https://ci.appveyor.com/project/scivision/nexrad-quick-plot)\n[![image](https://img.shields.io/pypi/pyversions/NEXRAD-quickplot.svg)](https://pypi.python.org/pypi/NEXRAD-quickplot)\n[![image](https://img.shields.io/pypi/format/NEXRAD-quickplot.svg)](https://pypi.python.org/pypi/NEXRAD-quickplot)\n[![Maintainability](https://api.codeclimate.com/v1/badges/d2df020d3c1e6522412a/maintainability)](https://codeclimate.com/github/scivision/nexrad-quick-plot/maintainability)\n[![PyPi Download stats](http://pepy.tech/badge/NEXRAD-quickplot)](http://pepy.tech/project/NEXRAD-quickplot)\n\n# Nexrad Quick-plot\n\nEasy Python download and plot NEXRAD N0Q compositive reflectivity.\nUses RGB high resolution PNG images of North America.\n\nTested with `pytest`, `flake8` and `mypy` type checking.\n\n## Install\n```sh\npython -m pip install -e .\n```\n\n## Usage\n\nRGB data scaling: NEXRAD N0Q base reflectivity maps.\n\n* Black: No Data\n* -32 dBZ .. 90 dBZ\n* 0.5 dBZ increment\n\n![NEXRAD N0Q RGB scaling](doc/n0q_ramp.png)\n\nThese data are reduced fidelity RGB images.\nWe use `xarray.DataArray` and plot image by image.\nFor high-fidelity science data, the lower level data are needed--contact us if interested.\n\n```python\nimport nexrad_quickplot as nq\n\ndat = nq.load('~/data/2015-01-19/nexrad/nexrad2015-01-19T01:15:00.png')\n\n>>> dat\n<xarray.DataArray (lat: 540, lon: 1220, color: 3)>\narray([[[255, 255, 255],\n        [255, 255, 255],\n        ...,\n        [255, 255, 255],\n        [255, 255, 255]]], dtype=uint8)\nCoordinates:\n  * lat      (lat) float64 23.0 23.05 23.1 23.15 23.2 23.25 23.3 23.35 23.4 ...\n  * lon      (lon) float64 -126.0 -125.9 -125.9 -125.8 -125.8 -125.7 -125.7 ...\n  * color    (color)  'R' 'G' 'B'\nAttributes:\n    filename:  ~/data/nexrad2015-01-19T01:15:00.png\n    wldfn:     None\n    time:      2015-01-19 01:15:00\n```\n\n`.lat` and `.lon` are vectors of geodetic latitude and longitude respectively, computed based on the `.wld` file corresponding to the images.\n\n\n\n\n### Download NEXRAD data\n\nGet\n[NEXRAD reflectivity data](https://mesonet.agron.iastate.edu/docs/nexrad_composites/)\nwith parallel download:\n```sh\ndownload-nexrad start stop outdir\n```\n\nexample:\ndownload from 2018-01-01 to 2018-01-02 to `~/data/nexrad`:\n```sh\ndownload-nexrad 2018-01-01T00 2018-01-03T00 ~/data/nexrad\n```\n\n### Plot NEXRAD reflectivity data\n\nNEXRAD QuickPlot plots are georegistered via \n[Cartopy](https://pypi.org/project/Cartopy/), \nwhich is the replacement for \n[deprecated Basemap](https://www.scivision.co/cartopy-replace-deprecated-basemap/)\n\n* Plot all data in directory:\n  ```sh\n  plot-nexrad ~/data/nexrad/\n  ```\n* Plot a specific file (subplots if multiple files specified):\n  ```sh\n  plot-nexrad ~/data/nexrad/2018-01-01T12:35:00.png\n  ```\n* Plot via file glob match:\n  ```sh\n  plot-nexrad ~/data/nexrad/ -pat 2018-01-01T12*.png\n  ```\n* Keogram (specify lat or lon and value):\n  ```sh\n  plot-nexrad ~/data/2018-01-01/nexrad/ -keo lat 40\n  ```\n\n## Notes\n\n### Coordinates\n\nEPSG:4326 coordinates (WGS84) are in `.wld` files, which are generally the\nsame for wide time spans of data. The\n[.wld format](https://mesonet.agron.iastate.edu/docs/radmapserver/howto.html#toc3.3)\nis like:\n```\n0.005 (size of pixel in x direction)\n0.0 (rotation of row) (Typically zero)\n0.0 (rotation of column) (Typically zero)\n-0.005 (size of pixel in y direction)\n-126.0 (x coordinate of centre of upper left pixel in map units--here it's WGS84 longitude)\n50.0 (y coordinate of centre of upper left pixel in map units--here it's WGS84 latitude)\n```\n\n\n### Mass image downscaling\n\nFor initial analysis, the original Nexrad image size of 12200 x 5400 pixels may be too high to complete in a reasonable time.\nI choose to downsize by a factor of 10, which takes a long time, but is a one-time process.\n\n```bash\nmkdir orig\ncp *.png orig\n\nnice mogrify -scale 10% \"*.png\"\n```\n\nIf you have trouble with this being very slow, try:\n\n```bash\nMAGICK_TEMPORARY_PATH=/run/shm nice mogrify -scale 10% \"*.png\"\n```",
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