Merge pull request #124 from jlaura/libload

## Unreleased

### Added

- A check to `generate_ground_point` when a GeoDataset is used to raise a `ValueError` if the algorithm intersects a no data value in the passed DEM. This ensures that valid heights are used in the intersection computation. Fixes [#120](https://github.com/DOI-USGS/knoten/issues/120)

### Changed

- Removed all `pyproj` calls from csm.py, abstracting them into the reprojection and pyproj.Transformer code inside utils.py. Updated the transformations to use the new pipeline style syntax to avoid deprecation warnings about old syntax.

### Fixed

- Added a check to `generate_ground_point` when a GeoDataset is used to raise a `ValueError` if the algorithm intersects a no data value in the passed DEM. This ensures that valid heights are used in the intersection computation.

- The init method that searches for the libusgscsm to support searching in the `csmplugins` subdirectory. This approach depends on being able to find `csmapi` in a standard location and then assumes that the `libusgscsm` shared library is in a subdirectoy of that `lib` directory. Fixes [#118](https://github.com/DOI-USGS/knoten/issues/118)

  - scipy

  - shapely

  - sphinx

  - usgscsm>=1.3.1

  - usgscsm>=2

  - pip:

    - sphinx-material

import ctypes

from ctypes.util import find_library

from distutils import sysconfig

from glob import glob

import os

import sys

import warnings

from . import csm

from csmapi import csmapi

# Register the usgscam plugin with the csmapi

libusgscsm_path = find_library('usgscsm')

if not libusgscsm_path:

    warnings.warn('libusgscsm not installed, unable to load shared library.')

    libcsmapi_path = find_library('csmapi')

    usgscsm_folder = os.path.join(os.path.split(libcsmapi_path)[0], "csmplugins")

    libusgscsm_path = ""

    if os.path.exists(usgscsm_folder):

        # Supports py < 3.10, if only supporting 3.10+ use: glob( "*[0-9].[0-9].[0-9].dylib", root_dir=usgscsm_folder)

        if sys.platform.startswith('darwin'):

            results = glob(os.path.join(usgscsm_folder, "*[0-9].[0-9].[0-9].dylib"))

        elif sys.platform.startswith('linux'):

            results = glob(os.path.join(usgscsm_folder, "*.so"))

        results.sort()

        libusgscsm_path = os.path.join(usgscsm_folder, results[-1])

libusgscsm = ctypes.CDLL(libusgscsm_path)

if not os.path.exists(libusgscsm_path):

    warnings.warn('libusgscsm not installed, unable to find shared library.')

if not libusgscsm._name:

    warnings.warn('Unable to load usgscsm shared library')

try:

    libusgscsm = ctypes.CDLL(libusgscsm_path)

except OSError:

    warnings.warn(f'Unable to load usgscsm shared library at {libusgscsm_path}')