Margins also continued to improve a non-GAAP operating margins for above 20% for the second consecutive quarter. We currently expect year-to-year revenue growth in the third quarter of around 19%, while the nominal growth rate is lower than the first half rate because of acquisition effects. We generally expect underlying performance to remain consistent with the first half. This expectation is based on two assumptions, one is that the euro centered crisis remains relatively contained to Europe and does not transform into a major macroeconomic contingent scenario. And the others that uncertainty related to the euro and the U.S. election doesn’t freeze investment decision makers into activity as they await greater clarity.
Our markets remain workable although the other states robustness are variable across product categories and across regions. Engineering and construction performance is currently being driven by heavy highway products which are demonstration strong growth as adoption rates of technology accelerate. Commercial and residential construction is not a meaningful source of growth although the picture on future prospects seems to be gradually brightening in North America.
Survey in other GeoSpatial products from the second quarter did not match the growth of the first quarter although we expect growth will improve in the second half. Our expectations for E&C on the second half assume a similar scenario to the first half with strong, heavy and high demand at generally negative environment in Europe, no meaningful recovery in North American, residential and commercial construction and generally workable conditions in other regions.
With this solution segment generated meaningful growth with the contributions from both agriculture and acquisitions. GIS was comparably flat because of revenue recognition of deferrals. Agricultural results held up despite the severe drought conditions in North America. While North America continued to produce credible year-to-year growth, we saw much stronger growth rates in agriculture in South America, Russia and China. While North America is still our most significant region, the strong performance from other regions partially mitigates the exposure to the effects the drought may have on North American demand.