Re: Non-positive altitude (was: Tile Set Flush Fixed)
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Some of the town I live in is on reclaimed land. And it is usual to have negative gps altitude. High tide and lots of rain and that’s actually true
Sent: 21 January 2019 23:29
Subject: [aprsisce] Non-positive altitude (was: Tile Set Flush Fixed)
I purposely suppress negative altitudes because they are not aprs101.pdf spec compliant.
If signed numbers were supported, I'm sure the format would not be presented as "aaaaaa". It's even worse with compressed position reports as the altitude is encoded in Base91 after going through some math. I did have an original bug whereby the altitude wasn't zero-filled which caused APRSISCE/32 altitude reports to be flagged as errors in other APRS applications. Specs are there to ensure cross-application compatibility.
Note: I also live barely above sea level and have seen negative altitude coming from my GPS. In that case, APRSISCE/32 simply drops the altitude from the transmitted format, even if enabled. Actually, zero is also dropped. The altitude must be > 0.0 in order to be included in a beacon.
On 1/21/2019 6:16 PM, ARNOLD HARDING kq6di@... [aprsisce] wrote: