Vaisala Energy Support
What solar values are shown on the map in solar prospecting and solar time series tool?
The Map Controller shows annual Global Horizontal Irradiance (GHI) and Direct Normal Irradiance (DNI). The map is derived from Vaisala’s solar dataset: the first comprehensive, contiguous, and high-resolution solar dataset with global coverage. The map images show the annual mean GHI or DNI based on 10+ year means from 1997/1999 – 2018 from the Vaisala 1.0 solar algorithm. The dataset is based on actual, half-hourly, high-resolution visible satellite imagery observations via the broadband visible wavelength channel at a 2 arc-minute resolution.
The color overlay on the map allows you to compare different regions using the color scale located on the left side of the Annual Mean Irradiance Tools. "Warm" colors like brown and orange indicate higher irradiance. "Cool" colors like purple and blue indicate lower irradiance. You can select different overlays based on the particular type of irradiance you are interested in: GHI or DNI.
More Solar Online Tools Questions
- How accurate is the data in the Solar Time Series Tools?
- The datasets give different answers. Which one is right?
- Why are there so many (5) different versions of solar data?
- Which weather data source should I pick?
- Why do the values in my TMY file change?
- What updates were applied to the datasets in November 2019?
- What's the latest month available in the solar time series tool?
- How do I enter a location?
- Why does the map disappear?
- How do I interpret the graphs provided by the Monthly Mean Irradiance Tools in the Prospecting Tools?
- What do the Annual Mean Irradiance Tools in the Prospecting Tools provide?
- How can I compare sites side-by-side in the Prospecting Tools?
- How much area is covered by the Solar Prospecting Tools?
- How accurate are the Solar Prospecting Tools?
- What data is shown in the Solar Time Series Viewer?
- What data can I get from the Solar Time Series Download tool?
- What is the Vaisala 1.0 dataset?
- What is the Vaisala 1.1 dataset?
- What is the Vaisala 1.2 dataset?
- What is the Vaisala 2.0 dataset?
- What is the Vaisala 2.1 dataset?
- What are the units of irradiance?
- What is the “TMY” Data Type in the Solar Time Series Download tool?
- What is the “Long-Term” Data Type in the Solar Time Series Download tool?
- Why does the data not match my observations?
- How do I input CSV files into PVSyst?
- How can I input time series data into PVSyst?
- What is Global Horizontal Irradiance?
- What is Direct Normal Irradiance?
- What is Diffuse Horizontal Irradiance?
- What affects solar radiation at a given site?
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