Inspect features

Press i to switch to inspect mode, and i (or Esc) again to leave it.

• Hover shows the top feature under the pointer in the status bar.
• Click lists every feature at that spot, drawn or not: roads, street names, buildings, parks, land cover, points of interest. The most specific come first, and the selected one is highlighted on the map.
• Click an entry, or press Tab / Shift+Tab, to switch between them.
• y copies the selected feature as JSON to the clipboard (OSC 52).

What the panel shows

For each feature:

• the style layer that draws it, or that no layer does
• its source and source layer, and the tile it came from
• geometry type, center, length or area, and vertex count
• all of its properties

“Drawn or not” matters: vector tiles carry far more than any style shows. Inspect is a quick way to learn what a tileset contains and what to filter on when you write a style.

From scripts

--pick COL,ROW with --snapshot prints the same information as JSON lines, one feature per line:

mapterm --at 38.8895,-77.0353 -z 16 --snapshot 100x40 --pick 50,20

The center cell of a 100×40 frame is the Washington Monument. Here are the first three features, with the translated name:xx properties left out:

{"_center": [-77.03524231910706, 38.88947540433334], "_geometry": "point", "_id": "7667613372", "_layer": "poi", "_source": "basemap", "_style_layer": "poi", "_tile": "14/4686/6268", "class": "monument", "name": "Washington Monument", "name_de": "Washington Monument", "name_en": "Washington Monument", "rank": 13, "subclass": "monument"}
{"_center": [-77.03524231910706, 38.88947540429358], "_geometry": "polygon", "_id": "7667613372", "_layer": "building", "_source": "basemap", "_style_layer": "building", "_tile": "14/4686/6268", "colour": "#b4a995", "render_height": 170, "render_min_height": 0}
{"_center": [-77.03427404165268, 38.88704930492635], "_geometry": "polygon", "_id": "15524265092", "_layer": "landcover", "_source": "basemap", "_style_layer": "landcover", "_tile": "14/4686/6268", "class": "grass", "subclass": "park"}

Fields that start with _ are mapterm’s: _layer is the source layer, _style_layer the style layer that draws it (absent when none does), _tile the z/x/y tile, _center a lon/lat. The rest are the feature’s own properties.

Data layers you add with --geojson are listed first.