# Source Registry

## Source #1
- **Title**: Civil NIIRS Reference Guide
- **Link**: https://irp.fas.org/imint/niirs_c/guide.htm
- **Tier**: L1
- **Publication Date**: Established standard (ongoing)
- **Timeliness Status**: ✅ Currently valid
- **Target Audience**: Military/intelligence imagery analysts
- **Research Boundary Match**: ✅ Full match — GSD requirements for vehicle detection
- **Summary**: NIIRS 6 required for vehicle type identification (~25-50cm GSD). Detailed vehicle description at ~10cm GSD.

## Source #2
- **Title**: Limiting Resolution Looking Down Through the Atmosphere
- **Link**: https://opg.optica.org/josa/abstract.cfm?uri=josa-56-10-1380
- **Tier**: L1
- **Publication Date**: Academic publication
- **Timeliness Status**: ✅ Currently valid (fundamental physics)
- **Summary**: Atmospheric turbulence limits ground resolution from high altitude to ~4.6cm. Independent of optics quality.

## Source #3
- **Title**: Pix4D — How to select Camera Focal Length and Flight Altitude
- **Link**: https://support.pix4d.com/hc/en-us/articles/202558849
- **Tier**: L2
- **Publication Date**: Updated regularly
- **Timeliness Status**: ✅ Currently valid
- **Summary**: GSD = (pixel_pitch × altitude) / focal_length. Standard formula for aerial imaging.

## Source #4
- **Title**: Airmobi A40 Pro Product Page
- **Link**: https://www.airmobi.com/product/a40-pro-40x-optical-zoom-3-axis-ai-tracking-gimbal-camera/
- **Tier**: L1 (manufacturer)
- **Publication Date**: 2024-2025
- **Timeliness Status**: ✅ Currently valid
- **Summary**: $2,299. 40x optical zoom, 170mm max FL, 1/2.8" Sony CMOS, 5MP, 3-axis gimbal. AI tracking. Detects vehicles up to 16km.

## Source #5
- **Title**: ViewPro Z40K Product Page
- **Link**: https://www.viewprouav.com/product/z40k-single-4k-hd-25-times-zoom-gimbal-camera.html
- **Tier**: L1 (manufacturer)
- **Publication Date**: 2024-2025
- **Timeliness Status**: ✅ Currently valid
- **Summary**: $3,000-5,000. 20x optical (40x hybrid) zoom, 1/2.3" Panasonic 25.9MP, 4K video, 3-axis gimbal.

## Source #6
- **Title**: SIYI ZT30 Product Page
- **Link**: https://shop.siyi.biz/products/siyi-zt30
- **Tier**: L1 (manufacturer)
- **Publication Date**: 2024-2025
- **Timeliness Status**: ✅ Currently valid
- **Summary**: $6,099-7,309. 30x optical zoom, 1/2.7" 8MP, 4K, thermal+LRF, 4-sensor pod. 9W average power.

## Source #7
- **Title**: DJI Zenmuse H30T Specs
- **Link**: https://enterprise.dji.com/zenmuse-h30-series/specs
- **Tier**: L1 (manufacturer)
- **Publication Date**: 2024-2025
- **Timeliness Status**: ✅ Currently valid
- **Summary**: $10,240-11,610. 34x optical, 1/1.8" 40MP, 4K, thermal 1280×1024, LRF. LOCKED TO DJI MATRICE PLATFORM.

## Source #8
- **Title**: LOONG VT500Rs Product Page
- **Link**: https://www.loonguav.com/vt500rs
- **Tier**: L1 (manufacturer)
- **Publication Date**: 2024-2025
- **Timeliness Status**: ✅ Currently valid
- **Summary**: Price unknown. 42x optical, 48MP (8000×6000), dual visible cameras, thermal, LRF. 1.2kg. Military ISR focus.

## Source #9
- **Title**: Sony FE 400-800mm F6.3-8 G OSS Announcement
- **Link**: https://alphauniverse.com/stories/sony-unveils-specialty-400800mm-f6-38-g-oss-super-telephoto-zoom-g-lens/
- **Tier**: L1 (manufacturer)
- **Publication Date**: 2025-02-26
- **Timeliness Status**: ✅ Currently valid
- **Summary**: £2,399 (~$3,000). 400-800mm f/6.3-8, 2,475g. Supports 1.4x/2x TC for 1120/1600mm. Shipping March 2025.

## Source #10
- **Title**: Gremsy T7 Specifications
- **Link**: https://gremsy.com/gremsy-t7-spec
- **Tier**: L1 (manufacturer)
- **Publication Date**: 2024-2025
- **Timeliness Status**: ✅ Currently valid
- **Summary**: $2,349. 3.175kg max payload. 3-axis, ±0.02° vibration. USB/CAN/UART. Phase One compatible.

## Source #11
- **Title**: Viewpro Viewlink Serial Command Protocol V3.3.3
- **Link**: https://www.viewprotech.com/index.php?ac=article&at=read&did=510
- **Tier**: L2 (manufacturer documentation)
- **Publication Date**: 2024
- **Timeliness Status**: ✅ Currently valid
- **Summary**: Documented serial UART and TCP protocol for controlling Viewpro gimbals from custom platforms.

## Source #12
- **Title**: ArduPilot ViewPro Gimbal Driver (AP_Mount)
- **Link**: https://github.com/ArduPilot/ardupilot/pull/22568
- **Tier**: L2 (open source)
- **Publication Date**: 2023-2024
- **Timeliness Status**: ✅ Currently valid
- **Summary**: Lua-based gimbal driver for Viewpro cameras in ArduPilot. Demonstrates serial integration feasibility.

## Source #13
- **Title**: MAVLink Gimbal Protocol v2
- **Link**: https://mavlink.io/en/services/gimbal_v2.html
- **Tier**: L1 (protocol standard)
- **Publication Date**: Ongoing standard
- **Timeliness Status**: ✅ Currently valid
- **Summary**: Standard protocol for gimbal control via MAVLink. Supports companion computer as gimbal manager.

## Source #14
- **Title**: UAVOS POD Stratospheric Earth Observation Payload
- **Link**: https://uasweekly.com/2026/02/02/uavos-unveils-stratospheric-earth-observation-payload/
- **Tier**: L2 (press release)
- **Publication Date**: 2026-02-02
- **Timeliness Status**: ✅ Currently valid
- **Summary**: 3.6kg, 69cm GSD from 15km, gyro-stabilized. Benchmark for stratospheric imaging. Price unknown (likely >>$30k).

## Source #15
- **Title**: A40TR Pro Product Page (Airmobi)
- **Link**: https://www.airmobi.com/product/a40tr-pro-40x-eo-ir-lrf-ai-object-tracking-gimbal-camera/
- **Tier**: L1 (manufacturer)
- **Publication Date**: 2024-2025
- **Timeliness Status**: ✅ Currently valid
- **Summary**: $7,499-7,999. 40x zoom EO + thermal + LRF. 3-axis gimbal. ±0.005° pointing. MIL-STD-810H certified.

## Source #16
- **Title**: Foxtech Seeker-30 TR Product Page
- **Link**: https://store.foxtech.com/seeker-30-tr-30x-optical-zoom-camera-with-3-axis-gimbal/
- **Tier**: L1 (manufacturer)
- **Publication Date**: 2024-2025
- **Timeliness Status**: ✅ Currently valid
- **Summary**: $3,899-4,299. 30x optical zoom, 2.13MP 1080p. Auto tracking. 4.0kg. Serial/PWM control.

## Source #17
- **Title**: High-altitude balloon payload stabilization research
- **Link**: https://iastatedigitalpress.com/ahac/article/5570/galley/5436/view/
- **Tier**: L1 (academic)
- **Timeliness Status**: ✅ Currently valid
- **Summary**: Balloon payloads experience continuous rotation and pendulum swinging. Active gimbals may be insufficient alone. Passive stabilization through suspension design is critical.

## Source #18
- **Title**: Sony RX10 IV Specifications
- **Link**: https://www.bhphotovideo.com/c/product/1361560-REG/
- **Tier**: L1
- **Publication Date**: 2017 (product), specs current
- **Timeliness Status**: ✅ Currently valid (still in production)
- **Summary**: $1,700. 1" sensor 20MP, 24-600mm equiv (8.8-220mm actual), 2.41µm pixel pitch. 4K video.
