Government sales improved to $1.7 million compared with $0.2 million for the prior year. Growth came from domestic and foreign sources. Substantially all government sales during the period were programmatic. Intermap is pursuing government programs of record in North America, Europe, South America and Southeast Asia, which fall under multiyear award contracts that include requirements for large-scale 3D GEOINT to support strategic data infrastructure, which is suitable for Intermap's 3D elevation data.
Commercial sales recognized a 39% increase in subscription-based revenue compared with the second quarter of 2021. Intermap's recurring subscription sales now comprise 32% of total revenue. Unearned Revenue, a balance sheet item, increased to $2.2 million on June 30, 2022 from $1.7 million at December 31, 2021, resulting from an increase in prepaid software subscriptions, representing significant growth in high-margin, cash-generating accounts.
The number of...