A map showing the ground beneath the trees can be one of a hunter's most useful views of a property. Satellite images and aerial photos show the colors and outlines of leaves at the canopy, leaving the land below out of sight. Laser altimetry (LIDAR) measures the ground through openings in that canopy. It reveals benches, saddles, slight funnels, and aging ditches that ordinary topographic maps cannot resolve and photos cannot show at all. Those features guide deer movement. Detailed terrain relief helps hunters understand travel routes and access, but the ground's shape alone cannot reveal where deer bed.
KEY FINDINGS
- Photos capture treetops; LIDAR measures the earth below. Satellite pictures and aerial views record the canopy's outer surface. Laser-based terrain models measure uncovered earth underneath, the surface deer walk across and hunters work.
- The important landforms are small. Deer follow a bench around a hillside, pass over a saddle, or use a ditch crossing that gathers much of a drainage's traffic onto a single trail. These landforms often involve just a few feet of height change, too slight for ordinary topo contours to resolve and impossible to see in photos.
- Land shape explains travel and ways in. Topography drives funnels, narrowed passages, benches, and crossings over creeks. Detailed relief locates them accurately, letting hunters see the constriction that forces travel instead of guessing which route deer take.
- Land shape cannot honestly identify a deer's bed. Bedding depends on how cover is arranged, including the thickness of its visual screen and the density of growth underneath, rather than landforms. Placing a “buck beds here” marker using only terrain sells a conclusion that research does not back.
ITHE ROOF AND THE FLOOR
Why photos end at the treetops
Any overhead photo captures reflected light from the uppermost surface in view. That includes satellite pictures, drone shots, and the flights without leaves that hunters value. In wooded country, the surface is the treetops, rather than soil under them. Even photos taken with bare branches reveal trunks and shadows while offering only clues about the land's contours. LIDAR takes another approach: an aircraft sends out laser pulses and measures how long their reflections take to return. Some pass between branches, hit soil, and reflect back. Those measurements can be filtered to retain only reflections from the earth, creating an exposed-land model as though the trees had been removed. Displayed with relief shading, it replaces a flat image of green with a sculpted view of the landscape. Bumps, cuts, and level patches under the trees come into sight. Where lidar of high quality is available, the detail can reveal a bench with a rise of a couple of feet.
IITHE FEATURES THAT MOVE DEER
Slight terrain changes, major effects
Deer tend to prefer travel that takes less work and offers greater concealment. Topography shapes those paths. A bench is a level shelf partway up a hillside. Across steep terrain, it provides an easy, flat route that deer follow around the slope. A saddle is a ridgeline's low depression. Deer use that pass between drainages instead of going over the summit. A funnel or constriction forms when a steep slope, wet lowland, or line of fencing narrows the ground available to hunt. It can gather deer traffic into a passage far slimmer than the land around it. In crop fields, a ditch or erosion head-cut, an abrupt eroded drop where a ditch begins, can direct much of the deer traffic within a section through a single place to cross. Photos cannot reliably reveal any of these features. Most also fall below the detail a standard topo can distinguish with contours spaced ten or twenty feet apart. Detailed relief makes them clear. Locating them by walking can require seasons; a quality terrain layer can shorten the hunt for them.
Swipe table to see every column
| Feature | What it is | On a photo / topo map | What fine relief shows | Why deer use it |
|---|---|---|---|---|
| Bench | A flat shelf on a slope | Often hard to see | A clear level shelf across the grade | An easy, hidden travel lane across steep ground |
| Saddle | A low dip in a ridgeline | Maybe, if large | The exact low crossing point | The lowest-effort pass between drainages |
| Funnel / pinch | Where huntable ground narrows | Often hard to see | The precise width of the squeeze | Forces many deer through one corridor |
| Ditch / head-cut | A cut through a field or flat | Often hard to see | A sharp linear channel | Concentrates field movement into one crossing |
| Terrace / old edge | An abandoned field or plow line | Faint at best | A crisp step in the ground | A subtle edge deer travel and skirt |
Detailed relief reveals the earth under the forest, the surface deer travel.
IIITHE HONEST BOUNDARY
Reading routes without predicting beds
We do not predict bedding using land shape by itself. The temptation is to extend travel logic beyond its reach: if topography explains routes, it must also explain beds. That leap can produce a confident marker claiming a buck beds on a particular point or bench. Research does not back that conclusion. Habitat-use studies involving male white-tailed deer in adulthood, including work by Pollock and his colleagues in 1994 in Texas, found extensive use of places offering dense visual screening. Our own blind-holdout evaluation detected no bedding signal from terrain by itself. We tested with observations excluded from model training. With terrain as its only input, the model separated bedding observations from non-bedding records at essentially the level of chance. Cover supplied useful predictive information about bedding; landforms supplied none. That sets the truthful limit: detailed relief provides an excellent view of deer travel and ways a hunter can reach a location without detection. It does not show where they bed. Interpreting bedding requires reading cover, especially thick pockets with visual screening and dense structure. A responsible tool explains this instead of marketing a terrain marker the actual ground cannot justify. We believe tools should make that limit clear.
IVFINE RELIEF, FOR THE WHOLE STATE
Building a base map from the earth under trees
All of this is useless if a terrain layer cuts off at a county boundary or access to it is blocked. Our method builds a statewide terrain base layer from elevation data covering the entire state. Shaded relief, slope readings, and the direction slopes face reveal subtle landforms, with laser-grade detail added wherever high-resolution data is available. Before visiting the ground, a hunter can examine terrain anywhere in the state, picking out benches, saddles, and narrow places that funnel drainage. High-resolution lidar brings those features into sharper focus wherever it exists. Interpreting the terrain also involves judging wind and the rising or falling air that moves scent. Paired with the honest limit described above, this lets a careful hunter study the land on a screen, then check those observations outdoors to confirm knowledge that once required decades of walking the ground.
Hunters can use land shape to interpret deer routes and hidden approaches, while cover informs their assessment of beds. Our rule keeps those conclusions distinct.
NOTES AND SOURCES
- LIDAR, short for light detection and ranging, filters reflections off the earth from laser pulses passing through openings in the canopy. Those measurements form a digital model of exposed terrain. Common products calculated from it include relief shading, slope, and slope direction. Our foundation is elevation data covering the state, with finer relief added wherever available.
- Screening cover and habitat use: In Texas in 1994, Pollock and colleagues found that adult male white-tailed deer used areas with thick screening cover heavily. Our independent bedding model, tested on a blind holdout using terrain alone, performed at chance level; cover provided a signal capable of transfer. We therefore describe bedding as a suitability zone based on cover, paired with a confidence tier, never as a predicted point based on terrain.
- Limits: terrain points to possible movement and access without guaranteeing either. Deer follow terrain with varying likelihood, and pressure, food, and cover can each shift animals away from the apparent route. How clearly small terrain features appear depends on the elevation data behind the map. This information does not forecast where any particular animal will be.
Fully Drawn Research is an independent data analysis desk, not affiliated with any state wildlife agency, transportation agency, mapping provider or outfitter. Fully Drawn Research is an independent data and analysis desk. This paper is educational: it explains what fine-relief terrain data reveals about deer movement and access, and is explicit that terrain does not predict bedding, which is cover-driven. FDR maps terrain features as geographic facts and expresses bedding as a cover-derived zone with a confidence tier; nothing here predicts the location or behavior of a specific animal or guarantees a hunting outcome.
Keep reading
FDR Scout puts research like this on the map of the ground you hunt. Open Scout →