4K All Sky Imager for Cloud Detection and Solar Forecasting

Project Version for Weather Stations, Solar PV Plants and Environmental Monitoring

The JW-TK(LC12) 4K All Sky Imager is a project-ready ground-based sky imaging system developed for automatic cloud detection, cloud cover monitoring, cloud movement observation and solar power forecasting.

It captures high-resolution 4000 × 3000 pixel full-sky images through a hemispheric optical system and processes the images to identify cloud distribution and local sky conditions. Integrated GPS, outdoor protection, data storage and remote communication make the system suitable for permanent field deployment.

The project version is designed for solar PV plants, automatic weather stations, environmental monitoring networks, airports, universities, observatories and system integration projects that require stable sky imaging without building a complete camera and software system from the beginning.

It can be supplied as a standalone all sky camera or integrated with a solar weather monitoring station, solar radiation sensors, data loggers and a remote monitoring platform.

Product Overview

The JW-TK(LC12) All Sky Imager combines a high-resolution image sensor, ultra-wide-angle optical lens, embedded processor, outdoor enclosure, GPS module, communication interface and cloud analysis software.

During operation, the system automatically captures images of the visible sky hemisphere at a configured interval. The internal software analyzes the images to distinguish cloud-covered areas from clear-sky areas and generates visual and numerical sky condition results.

The original image, processed image, cloud cover result, capture time, GPS information and device status can be stored locally or uploaded to a remote monitoring platform.

The system is intended for practical field projects where stable operation, standardized output, communication compatibility and outdoor reliability are more important than extensive algorithm modification.

What Can the All Sky Imager Monitor?

Depending on the selected software and project configuration, the system can provide:

• Original full-sky image
• Processed cloud detection image
• Total cloud cover
• Clear-sky percentage
• Cloud-covered percentage
• Cloud distribution
• Cloud position
• Local sky condition
• Solar position
• Capture date and time
• GPS position
• Equipment operating status
• Historical image records
• Historical cloud cover trends
• Image sequence for cloud movement observation

Additional outputs may be available according to the final software version.

Please request the latest data output list before placing an order.

How the System Works

1. Full-Sky Image Acquisition

The hemispheric lens captures a wide view of the sky at a preset interval.

The image interval can be configured according to the application. Shorter intervals may be used for cloud movement or solar forecasting projects, while longer intervals may be selected for routine weather observation.

2. Image Processing

The system processes the original image according to the optical configuration and observation area.

Processing may include:

• Valid sky area identification
• Horizon masking
• Image correction
• Brightness adjustment
• Solar-area treatment
• Obstruction-area exclusion
• Cloud and clear-sky segmentation

3. Cloud Detection

The cloud detection algorithm analyzes image brightness, color and visual features to distinguish cloud areas from clear-sky areas.

The system then calculates cloud cover and produces a processed cloud distribution image.

4. Data Storage

The following information can be stored locally:

• Original images
• Processed images
• Cloud cover results
• GPS information
• Time stamps
• System status
• Historical records

Storage capacity and retention time depend on the image interval, image quality and selected storage configuration.

5. Remote Transmission

Images and analytical data can be transmitted to a local server or cloud platform through the selected communication method.

Project communication options may include:

• Ethernet
• RJ45
• 4G LTE
• Wi-Fi
• Local network
• Customized data interface

The available communication method should be confirmed according to the final product configuration.

Project Version vs Research Version

JW-IoT provides different all sky imaging configurations for engineering projects and scientific research.

For users who require original datasets, advanced cloud analysis and research-oriented customization, explore the 4K All Sky Imager for Cloud Cover Monitoring – Research Version.

For solar PV plants, weather stations and standard monitoring projects, the JW-TK(LC12) Project Version is normally the more practical choice.

Applications

Solar PV Power Forecasting

Cloud movement can cause rapid fluctuations in solar irradiance and photovoltaic power output.

The all sky imager provides localized sky images that can help solar project operators and forecasting systems observe:

• Approaching cloud cover
• Cloud distribution
• Rapid sky condition changes
• Local cloud movement
• Clear-sky and cloudy-sky transitions
• Potential irradiance fluctuations

When combined with irradiance sensors, module temperature sensors and PV power data, sky images can support:

• Short-term solar forecasting
• PV output fluctuation studies
• Solar resource analysis
• Plant performance evaluation
• Energy scheduling research
• Grid integration studies
• O&M decision support

The system can be integrated with the Solar Weather Monitoring Station for Utility Photovoltaic Power Plants.

Automatic Weather Stations

A conventional weather station measures physical parameters such as:

• Air temperature
• Relative humidity
• Atmospheric pressure
• Wind speed
• Wind direction
• Rainfall
• Solar radiation

The all sky imager adds visual cloud and sky information to the weather station.

This allows operators to compare cloud conditions with changes in solar radiation, temperature, rainfall and other meteorological parameters.

Explore additional weather station products for complete field monitoring systems.

Solar Radiation Monitoring

Solar radiation sensors measure irradiance at the monitoring site, while the all sky imager visually records the cloud conditions affecting irradiance.

Combining the two data sources can help users understand:

• Why irradiance changed
• Whether a reduction was caused by passing clouds
• How cloud cover influenced PV output
• When clear-sky conditions occurred
• Whether cloud movement caused rapid power fluctuations

The system can be used together with a Photoelectric Total Solar Radiation Sensor for RS485 Irradiance Monitoring or other radiation sensors.

Meteorological Observation

The system can be deployed at:

• National and regional weather stations
• University meteorological stations
• Environmental observation sites
• Climate monitoring stations
• Mountain weather stations
• Remote field monitoring sites
• Agricultural meteorological stations

It provides continuous ground-based visual records that complement numerical sensor measurements and satellite cloud observations.

Environmental Monitoring

Cloud cover affects solar radiation, surface temperature, atmospheric stability and local environmental conditions.

The all sky imager can support:

• Urban environmental monitoring
• Ecological observation
• Microclimate studies
• Atmospheric monitoring
• Smart city projects
• Long-term environmental datasets
• Remote environmental observation

Aviation and Airport Weather Projects

The system can provide visual cloud and sky information for airport meteorological observation and aviation weather research.

Possible uses include:

• Local sky condition records
• Cloud cover observation
• Weather station data comparison
• Visibility-related research
• Historical sky image storage

The all sky imager is not intended to replace certified aviation safety instruments unless integrated into an approved system.

Agricultural Weather Monitoring

Cloud cover influences sunlight, crop photosynthesis, evapotranspiration and greenhouse energy balance.

The system can be integrated into agricultural weather stations for:

• Crop microclimate research
• Solar radiation analysis
• Evapotranspiration studies
• Irrigation research
• Greenhouse environmental monitoring
• Agricultural weather observation

Observatory and Telescope Site Monitoring

Cloud conditions directly affect astronomical observation.

An all sky imager can help observatories record local sky conditions and support:

• Observation scheduling
• Cloud cover records
• Sky condition archiving
• Equipment protection decisions
• Remote observatory management

Nighttime performance depends on the selected camera configuration and image processing software and should be confirmed before ordering.

All Sky Imager and Satellite Cloud Images

Ground-based all sky images and satellite images serve different purposes.

Ground-Based All Sky Imager

• Observes local sky conditions from the monitoring site
• Provides high-frequency images
• Records small-scale cloud changes
• Can be synchronized with local irradiance and weather data
• Supports site-specific solar forecasting

Satellite Cloud Images

• Cover large geographic areas
• Show regional cloud movement
• Support wide-area weather analysis
• May have lower temporal or spatial relevance for a single PV site

For solar forecasting and local weather monitoring, ground-based sky images can complement satellite information.

System Integration

The JW-TK(LC12) can be supplied as an individual instrument or integrated into a complete monitoring solution.

A typical system may include:

1. 4K All Sky Imager
2. Solar radiation sensor
3. Module temperature sensor
4. Ambient temperature and humidity sensor
5. Wind speed and direction sensor
6. Rain gauge
7. Data logger or industrial controller
8. Ethernet or 4G communication unit
9. Local or cloud server
10. Monitoring platform
11. API or database interface
12. Power supply and installation accessories

JW-IoT can support communication integration, sensor configuration, platform connection and remote technical support.

Communication and Data Management

Project communication can be configured according to site conditions.

Possible communication methods include:

• Ethernet
• RJ45
• 4G LTE
• Wi-Fi
• Local area network
• Remote server upload
• Customized API

The monitoring platform may provide:

• Real-time sky image display
• Cloud cover visualization
• Historical image query
• Historical data trends
• Device status monitoring
• GPS position display
• Image download
• Data export
• User account management
• Remote system diagnostics

Platform and API functions should be confirmed according to the final project requirements.

GPS Positioning and Time Synchronization

Accurate time stamps are important when sky images are compared with:

• Solar irradiance data
• PV power output
• Weather station data
• Satellite images
• Numerical forecasting models
• Multiple monitoring stations

The integrated GPS function can provide positioning and time information for project deployment.

The final GPS and time synchronization method should be confirmed in the project specification.

Outdoor Protection

The project version adopts an IP66 outdoor enclosure designed for permanent field installation.

It helps protect internal components against:

• Outdoor dust
• Rain
• Wind-blown particles
• General field weather exposure

IP66 protection does not eliminate the need for correct installation and maintenance.

The optical dome must remain clean and unobstructed to maintain image quality.

Installation Requirements

Open Sky View

Install the all sky imager where the visible sky is as unobstructed as possible.

Avoid locations close to:

• Tall buildings
• Trees
• Towers
• Chimneys
• Overhead cables
• Lighting poles
• Reflective structures
• Large antennas

Obstructions can reduce the valid sky area and affect cloud cover calculation.

Stable and Level Mounting

The device should be mounted on a stable horizontal structure.

The top optical lens must face upward, and the mounting base should remain level.

Correct Orientation

Record the installation orientation when directional cloud distribution or solar position is required.

The orientation should be consistent with the system software configuration.

Avoid Strong Reflection

Do not install the device directly beside highly reflective metal roofs, glass curtain walls or bright surfaces.

Strong reflections may interfere with image processing.

Power and Communication

Provide stable power and suitable communication according to:

• Image capture interval
• Transmission frequency
• Local storage requirements
• Network coverage
• Remote access requirements
• Site maintenance conditions

Optical Dome Maintenance

Regularly inspect and clean the optical surface.

Potential contamination includes:

• Dust
• Rain marks
• Snow
• Frost
• Insects
• Bird droppings
• Salt spray
• Industrial particles

Use a non-abrasive cleaning method suitable for the optical surface.

Factors Affecting Cloud Detection

Cloud detection performance can be influenced by:

• Direct sunlight
• Sunrise and sunset
• Thin cirrus clouds
• Haze
• Fog
• Dust
• Rain droplets on the dome
• Snow or frost
• Strong reflections
• Nearby obstructions
• Artificial lighting
• Nighttime conditions

For important forecasting projects, JW-IoT recommends evaluating the system under representative local weather and lighting conditions.

Software adjustment may be available after technical assessment.

Typical Technical Specifications

Technical specifications may vary according to the selected camera, storage, communication and software configuration. Request the latest datasheet before procurement.

Standard Project Configuration

A standard project package may include:

• JW-TK(LC12) all sky imager
• Outdoor mounting base
• Power supply cable
• Communication cable or wireless communication module
• Local storage
• Cloud detection software
• Configuration documentation
• Installation guide
• Remote commissioning support

Optional accessories may include:

• Solar power system
• Industrial data logger
• 4G communication gateway
• Ethernet communication module
• Weather station sensors
• Pyranometer
• Module temperature sensor
• Outdoor cabinet
• Lightning and surge protection
• Cloud monitoring platform
• API integration
• Customized mounting structure

The final delivery list should be confirmed in the quotation.

How to Select the Correct Configuration

Please provide the following project information:

1. Project application
2. Installation country and site
3. Number of monitoring points
4. Daytime or day-and-night monitoring requirement
5. Required image interval
6. Required cloud output parameters
7. Local storage period
8. Image transmission frequency
9. Available power supply
10. Available network connection
11. Required weather sensors
12. Cloud platform or API requirements
13. Local environmental conditions
14. Expected installation date

JW-IoT will recommend an appropriate camera, storage, communication and platform configuration.

Why Choose JW-IoT?

JW-IoT provides more than a standalone sky camera.

Our project support can include:

• All sky imager configuration
• Weather sensor integration
• Solar radiation monitoring
• Data logger and gateway configuration
• Ethernet and 4G communication
• Cloud platform connection
• API integration
• OEM and private-label service
• Installation guidance
• Remote commissioning
• Long-term technical support

This allows system integrators, EPC contractors, energy companies and environmental monitoring partners to build a complete sensor-to-cloud monitoring solution.

Request a Quotation

To receive a quotation for the JW-TK(LC12) 4K All Sky Imager Project Version, please provide your application, installation location, required image interval, communication method, storage period, platform requirements and quantity.

Contact JW-IoT for project support and quotation

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