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DeltaF Algorithm Usage
======================
Delta F is the difference between the magnitude of magnetic vector measurements,
and a scalar total-field measurement made by independent sensors. Read more
about the [DeltaF Algorithm](./DeltaF.md).
`geomag.py --algorithm deltaf [--deltaf-from {geo, obs, obsd}]`
### Reference Frames
- `geo`: `[X, Y, Z, F]`
- `obs`: `[H, E, Z, F]`
- `obsd`: `[H, D, Z, F]`
## Example
To compute DeltaF from HEZF data for Tucson observatory:
```
geomag.py \
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--observatory TUC \
--type variation \
--interval minute \
--inchannels H E Z F \
--outchannels G \
--starttime 2015-11-01T00:00:00Z \
--endtime 2015-11-01T00:10:00Z \
--input-edge cwbpub.cr.usgs.gov \
--input-edge-port 2060 \
--output-iaga-stdout
```
### Output
```
Format IAGA-2002 |
Source of Data United States Geological Survey (USGS) |
Station Name Tucson |
IAGA CODE TUC |
Geodetic Latitude 32.174 |
Geodetic Longitude 249.267 |
Elevation 946 |
Reported GNULNULNUL |
Sensor Orientation HDZF |
Digital Sampling 100.0 second |
Data Interval Type filtered 1-minute (00:15-01:45) |
Data Type variation |
# DECBAS 7258 (Baseline declination value in |
# tenths of minutes East (0-216,000)). |
# Vector 1-minute values are computed from 1-second values using |
# the INTERMAGNET gaussian filter centered on the minute. Scalar |
# 1-minute values are computed from 1-second values using the |
# INTERMAGNET gaussian filter centered on the minute. |
# CONDITIONS OF USE: The Conditions of Use for data provided |
# through INTERMAGNET and acknowledgement templates can be found at |
# www.intermagnet.org |
DATE TIME DOY TUCG TUCNUL TUCNUL TUCNUL |
2015-11-01 00:00:00.000 305 -174.39 99999.99 99999.99 99999.99
2015-11-01 00:01:00.000 305 -174.40 99999.99 99999.99 99999.99
2015-11-01 00:02:00.000 305 -174.40 99999.99 99999.99 99999.99
2015-11-01 00:03:00.000 305 -174.39 99999.99 99999.99 99999.99
2015-11-01 00:04:00.000 305 -174.39 99999.99 99999.99 99999.99
2015-11-01 00:05:00.000 305 -174.41 99999.99 99999.99 99999.99
2015-11-01 00:06:00.000 305 -174.39 99999.99 99999.99 99999.99
2015-11-01 00:07:00.000 305 -174.34 99999.99 99999.99 99999.99
2015-11-01 00:08:00.000 305 -174.39 99999.99 99999.99 99999.99
2015-11-01 00:09:00.000 305 -174.39 99999.99 99999.99 99999.99
2015-11-01 00:10:00.000 305 -174.39 99999.99 99999.99 99999.99
```