SOTLAS ‐ https://sotl.as/map
Basic SOTA summit info
CalTopo - www.caltopo.com - Identifies land ownership as far as private/public information goes. It's also an incredibly useful tool for trip planning and general mapping. CalTopo has an android (and maybe iOS?) application for portable use with the ability to download maps for offline use.
USGS Protected Areas Database ‐ https://maps.usgs.gov/padus/
“Official” inventory of public open space and private protected areas. Identify specific Agency ownership (BLM, USFS, NPS, etc…). Can pan/zoom by map, or enter summit name (if identified Mtn), click through to drop down to see site specific information (owner type, name, public access, etc). Note that private land is excluded from this db.
AcreValue.com ‐ https://www.acrevalue.com/
Basic land info, will let you know owner name or just “government owned”. Unreliable parcel info. Lists of John – a list of peaks and associated resources (mostly maps) https://listsofjohn.com/
GIS (Geographic Information System) – Most Counties use this type of db. Ownership info is limited in CA but good in NV. Detailed information varies by County. Search for “X County GIS Mapping” or similar.
Los Angeles County (not City) ‐ https://planning.lacounty.gov/gisnet (accept terms and launch) Ex. Mount Bliss (north of Duarte) – zoom, identify parcels, shows incorporated City of Duarte. City of Duarte website (Planning/Zoning) shows as Open Space.
San Diego County – San Diego GIS https://www.sangis.org/ Select “interactive maps” Ex. El Cajon Mountain, zoom in for Parcel Report…assessor is $0 = agency land. Does not identify owner, however, go back to USGS db and it shows Cleveland Natl Forest is owner.
Clark County, NV – GISMO https://clarkcountygis‐ccgismo.hub.arcgis.com/ Scroll down to “Open Web” You may need to change the base layer to see more aerial photo (NAIP 2013 works well but old). Zoom in to area and check ownership as needed.
Maricopa County, AZ ‐ https://www.maricopa.gov/3942/GIS‐Mapping‐Applications Use Parcel Viewer (Parcels)