gisweb-screenshots

gisweb.py

import json

import fiona
import requests


def get_map(base_url, parcel_id, out_path, bbox_scale_factor=1.25):
    parcel_id_clean = parcel_id.replace("-", "")

    state = {
        "Application": "GISWEBApp",
        "MapTab": "GISWEBMap",
        "Level": "",
        "Search": "PropertySearch",
        "SearchCriteria": {"ParcelIDautocomplete": parcel_id},
        "Action": "0",
        "TargetLayer": "ParcelsStacked",
        "TargetIds": [parcel_id_clean],
        "ActiveMapId": parcel_id_clean,
        "ActiveDataId": parcel_id_clean,
    }
    data = {"m": "GetSelectionExtent", "state": json.dumps(state)}

    select_url_resp = requests.post(f"{base_url}Services/Selection.ashx", data=data)
    select_url_resp.raise_for_status()
    select_bbox = select_url_resp.json()["extent"]
    bbox_dims = [
        select_bbox[2] - select_bbox[0],
        select_bbox[3] - select_bbox[1],
    ]
    select_bbox_scaled = [
        select_bbox[0] - bbox_dims[0] * bbox_scale_factor,
        select_bbox[1] - bbox_dims[1] * bbox_scale_factor,
        select_bbox[2] + bbox_dims[0] * bbox_scale_factor,
        select_bbox[3] + bbox_dims[1] * bbox_scale_factor,
    ]

    state = {
        "Application": "GISWEBApp",
        "MapTab": "GISWEBMap",
        "Level": "",
        "Search": "PropertySearch",
        "SearchCriteria": {},
        "Action": 0,
        "TargetLayer": "ParcelsStacked",
        "TargetIds": [parcel_id],
        "ActiveMapId": parcel_id,
        "ActiveDataId": parcel_id,
        "Proximity": "",
        "SelectionLayer": "",
        "SelectionIds": [],
        "Query": "ParcelsAll",
        "DataTab": "ParcelSummaryInfo",
        "MarkupCategory": "MarkupPublic",
        "MarkupGroups": [],
        "Markup": [],
        "FunctionTabs": 63,
        "ActiveFunctionTab": 4,
        "Extent": {"bbox": select_bbox_scaled},
        "VisibleLayers": {
            "GISWEBMap": ["AddressLabels", "ParcelLabels", "ParcelsStacked"],
            "CritResourcePlan": [
                "AddressLabels",
                "ParcelLabels",
                "ParcelsStacked",
                "100YearFloodplain",
                "SteepSlopesOverlay",
                "WaterProtectionOrdinanceBuffers",
                "Y2018ElevationContours100ft",
                "Y2018ElevationContours60ft",
                "Y2018ElevationContours40ft",
                "Y2018ElevationContours20ft",
                "Y2018ElevationContours4ft",
            ],
            "Stormwater": [
                "AddressLabels",
                "ParcelLabels",
                "ParcelsStacked",
                "StormwaterFacilities",
            ],
            "Zoning": [
                "ParcelLabels",
                "ParcelsStacked",
                "Proffers",
                "ZMAswithProffersLabels",
                "ZoningClassifications",
                "ZoningEntranceCorridors",
                "NaturalResourceExtractionOverlay",
                "AddressLabels",
            ],
        },
        "VisibleTiles": {
            "GISWEBMap": ["public_basemap", "public_labels"],
            "CritResourcePlan": ["public_basemap", "public_labels"],
            "Stormwater": ["public_basemap", "public_labels"],
            "Zoning": ["public_basemap", "public_labels"],
        },
    }
    data = {
        "m": "MakeMapImage",
        "state": json.dumps(state),
        "width": 768,
        "height": 512,
    }

    map_url_resp = requests.post(f"{base_url}Services/MapImage.ashx", data=data)
    map_url_resp.raise_for_status()
    map_url = map_url_resp.content.decode().strip('"')

    map_resp = requests.get(f"{base_url}{map_url}")
    map_resp.raise_for_status()

    with open(out_path, "wb") as fp:
        fp.write(map_resp.content)


base_url = "https://gisweb.albemarle.org/gpv_51/"
parcels = fiona.open(
    "/Users/joshuacarp/Downloads/parcels_shape_current/Parcels_current.shp"
)

for parcel in parcels[::100]:
    bbox = [int(bound) for bound in shape.bounds]
    get_map(
        base_url,
        parcel["properties"]["PIN"],
        f"images/{parcel['properties']['PIN']}.png",
    )