Spatial task
Please select an appropriate map projection for the US states layer, and reproject the data layer using the selected projection. Please also generate an HTML report to explain why you choose the projection.
Dataset
The states boundaries of the US downloaded from OpenStreetMap (GCS: EPSG4326)
Result
Reprojected map (Copilot picked Albers Equal Area Conic projection)
Reasons given by the Copilot in the report
Projection for US States Layer
Chosen Projection: EPSG:5070 – NAD83 / Conus Albers
Reason for Choice:
The Albers Equal Area Conic projection minimizes distortion of area, making it suitable for conterminous US.
It is a standard projection used for mapping large areas with east-west extent within the contiguous United States.
Generated report in HTML explaining the reasoning behind the map projection selection.
Generated code
import os
from qgis.core import QgsProject, QgsVectorLayer
import processing
def reproject_us_states():
# Define paths
input_layer_path = ‘C:/Users/17036/Downloads/DEMO/US_states.shp’
output_directory = ‘C:/Users/17036/AppData/Roaming/QGIS/QGIS3/profiles/default/python/plugins/SpatialAnalysisAgent-master/Default_workspace’
# Choose an appropriate projection. For the contiguous US, Albers Equal Area Conic is suitable.
target_crs = ‘EPSG:5070’ # NAD83 / Conus Albers
# Define output path
output_filename = ‘US_states_reprojected.shp’
output_path = os.path.join(output_directory, output_filename)
# Check if the output file already exists and if so, adjust the filename
file_base, file_ext = os.path.splitext(output_filename)
i = 1
while os.path.exists(output_path):
output_filename = f“{file_base}_{i}{file_ext}”
output_path = os.path.join(output_directory, output_filename)
i += 1
# Define the parameters for the reprojection
parameters = {
‘INPUT’: input_layer_path,
‘TARGET_CRS’: target_crs,
‘CONVERT_CURVED_GEOMETRIES’: False,
‘OUTPUT’: output_path
}
# Run the reprojection process
result = processing.run(‘native:reprojectlayer’, parameters)
# Load the reprojected layer into QGIS
reprojected_layer = QgsVectorLayer(result[‘OUTPUT’], ‘US_states_reprojected’, ‘ogr’)
QgsProject.instance().addMapLayer(reprojected_layer)
# Create an HTML report explaining the projection choice
html_content = f“””
<html>
<head><title>Projection Report</title></head>
<body>
<h1>Projection for US States Layer</h1>
<p>Chosen Projection: EPSG:5070 – NAD83 / Conus Albers</p>
<p>Reason for Choice:</p>
<ul>
<li>The Albers Equal Area Conic projection minimizes distortion of area, making it suitable for conterminous US.</li>
<li>It is a standard projection used for mapping large areas with east-west extent within the contiguous United States.</li>
</ul>
</body>
</html>
“””
# Save the HTML report
html_report_path = os.path.join(output_directory, “projection_report.html”)
with open(html_report_path, ‘w’) as report_file:
report_file.write(html_content)
# Print the path of the HTML report
print(html_report_path)
# Execute the function
reproject_us_states()