Documenting illegal forest clearing for prosecution: what the case file needs

When a patrol walks into a two-hectare clearing that wasn't there three months ago, the first question from the prosecutor's office is rarely "who did this." It's "when did this start, and can you prove it." A ranger's field report with a GPS pin and a photo from the day of discovery tells you the clearing exists today. It doesn't tell you it didn't exist in July. That gap is exactly where satellite imagery earns its place in an encroachment case file, and it's also where most case files fall apart under cross-examination.

What a satellite image actually proves, and what it doesn't

A dated satellite pass showing bare ground inside a boundary that was forested on an earlier pass establishes a timeline. That's its job: it tells you the change happened between date A and date B, and roughly where. It does not identify who cleared the land, what tool was used, or whether the person a patrol later cites is the same person who did it. Treat the imagery as the "when and where" layer of the case, and let ground evidence (witness statements, tracks, equipment found on site, interviews) carry the "who."

Prosecutors and magistrates in protected-area cases have seen enough weak files to be skeptical of anything presented as "the satellite proved it." Pair the imagery with your patrol log, not instead of it.

Building the encroachment case file

A file that holds up needs a few things in a specific order:

The "before" image, dated, showing the compartment or patrol block as intact forest, scrub, or whatever the legitimate land cover was.

The "after" image from the same source and sensor type, dated, showing the clearing, road cut, cultivation strip, or mining pit.

A short note on how the area was flagged: did a monthly alert catch it, did a patrol report it first, or did a neighboring landholder complain. Record this honestly, because it will come up.

The ground-truth visit report that followed: date, GPS points walked, photos taken on-site, and anything found (stumps, tyre tracks, a hut, planted seedlings).

Coordinates for the boundary line itself, ideally the same ones your authority uses for the gazette notification or the protected area's legal boundary record, so nobody can argue the clearing was outside the line.

Keep the file in the order a non-technical reader can follow: boundary, before, after, ground visit, officer's statement. A prosecutor reading it cold should understand the timeline in under five minutes.

Chain of custody for satellite data

This is the part most rangers get wrong, not because they're careless but because nobody tells them it matters until a defense lawyer asks. Chain of custody for satellite imagery means you can show the image wasn't altered between the satellite pass and the courtroom. In practice that means:

Keep the original file as delivered, with its metadata (capture date, sensor, source) intact, not a cropped screenshot pasted into a report. Log who pulled the image, from what system, and on what date, same as you'd log evidence bags. If you print the image for a case file, note the print date and attach it to the digital original rather than relying on the printout alone. If your protected area authority has a legal or prosecutions officer, loop them in before the case file is finalized, not after charges are filed. They'll know what your jurisdiction's courts expect and what's overkill.

None of this requires special software. It requires treating the image the way you'd treat a confiscated chainsaw: documented, dated, and traceable back to where it came from.

Before you write "with satellite imagery" in your file

Don't claim the imagery proves intent, ownership, or identity. Say what it does show: forest cover present on this date, absent on that date, inside this boundary. Let the rest of the file carry the rest of the argument. A case built on a modest, accurate claim about the imagery tends to survive scrutiny better than one that oversells what a pixel can tell you.

For most authorities, the hard part is knowing which patch of the boundary to walk out to in the first place, months before a patrol happens across it by chance. If you want that first flag to come from a monthly pass over your own boundary rather than a lucky patrol route, Encroachment Alerting is built around exactly that gap. Have a look if your boundary's worth checking before the next clearing shows up on its own.