# Historical Topo Map Review - Denver, Colorado

**Use case:** 

Ready-to-run ASTM E1527-21 Sec. 8.3.4 historical topographic map review for five Colorado Front Range sites: map years, scales, quadrangles, data gaps.

## Input

```json
{
  "assets": [
    {
      "lat": 39.7392,
      "lon": -104.9903,
      "label": "Denver CO - downtown redevelopment parcel"
    },
    {
      "lat": 39.8083,
      "lon": -104.9339,
      "label": "Commerce City CO - refinery corridor parcel"
    },
    {
      "lat": 38.8339,
      "lon": -104.8214,
      "label": "Colorado Springs CO - downtown infill site"
    },
    {
      "lat": 38.234,
      "lon": -104.621,
      "label": "Pueblo CO - steel mill industrial parcel"
    },
    {
      "lat": 40.5853,
      "lon": -105.0844,
      "label": "Fort Collins CO - downtown commercial site"
    }
  ],
  "bufferMiles": 0,
  "includeUsTopo": true,
  "reviewStartYear": 1940,
  "intervalYears": 5,
  "maxMapsListed": 100,
  "maxAssets": 10,
  "verifyUpstream": true,
  "simulateOutage": "none"
}
```

## Output

```json
{
  "label": {
    "label": "Site label",
    "format": "string"
  },
  "latitude": {
    "label": "Latitude",
    "format": "number"
  },
  "longitude": {
    "label": "Longitude",
    "format": "number"
  },
  "maps_distinct_years": {
    "label": "Distinct map years",
    "format": "integer"
  },
  "earliest_map_year": {
    "label": "Earliest map year",
    "format": "integer"
  },
  "latest_map_year": {
    "label": "Latest map year",
    "format": "integer"
  },
  "astm_intervals_covered": {
    "label": "Intervals covered",
    "format": "integer"
  },
  "astm_intervals_uncovered": {
    "label": "Intervals uncovered",
    "format": "integer"
  },
  "astm_coverage_pct": {
    "label": "Interval coverage percent",
    "format": "number"
  },
  "astm_data_gap_present": {
    "label": "Data gap present",
    "format": "boolean"
  },
  "astm_longest_uncovered_span": {
    "label": "Longest uncovered span",
    "format": "string"
  },
  "astm_max_years_between_maps": {
    "label": "Max years between maps",
    "format": "integer"
  },
  "historical_topo_status": {
    "label": "Historical topo source status",
    "format": "string"
  },
  "us_topo_status": {
    "label": "US Topo source status",
    "format": "string"
  },
  "astm_analysis_status": {
    "label": "ASTM analysis status",
    "format": "string"
  },
  "maps_total_products": {
    "label": "Map products found",
    "format": "integer"
  },
  "largest_scale_denominator_any": {
    "label": "Largest scale available",
    "format": "integer"
  },
  "quad_names": {
    "label": "Quadrangle names",
    "format": "array"
  },
  "error": {
    "label": "Error",
    "format": "string"
  }
}
```

## About this Actor

This example demonstrates how to use [Historical Topographic Map Chronology - ASTM Phase I ESA 8.3.4](https://apify.com/malonestar/usgs-historical-topo-records-review) with a specific input configuration. Visit the [Actor detail page](https://apify.com/malonestar/usgs-historical-topo-records-review) to learn more, explore other use cases, and run it yourself.


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